[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/etrianodyssey2.jpg]]
[[caption-width-right:350:''[[MemeticMutation Even on TV Tropes]], [[http://www.youtube.com/watch?v=fUs2_7SYAI8 F.O.E.]]!'']]

''Etrian Odyssey''[[note]]known in Japan as ''Sekaiju no Meikyuu'' (世界樹の迷宮, literally "Labyrinth of the World Tree")[[/note]] is a first-person tile-based dungeon-crawler series published by {{Atlus}} and co-developed with Lancarse, consisting of four major installments, [[VideoGameRemake remakes]] of the first two games, with an additional installment and spin-off game on the way.

The series' most iconic feature is the in-game cartography system. The player is given a blank grid every time they enter a new area and must chart out their own map. The system is meant to recall retro games, where players had to map out their own progress while playing. Thankfully, the whole point is that the game doesn't force you to break out your own graph paper: you draw your maps on the DS' bottom screen and mark interesting locations with a variety of icons.

Also iconic are the infamous "F.O.E.s" ([[AltumVidetur Formido Oppugnatura Exsequens]] or, in the Japanese version, [[FunWithAcronyms Field-On Enemy]]) -- [[DemonicSpiders ridiculously overpowered]] PreExistingEncounters that roam the dungeons. If the player collides with an F.O.E., combat begins with a monster that is usually immensely [[BeefGate more powerful than everything else on the level, and meant to be avoided until the player is much stronger]]. When there's a message to the effect of "you suddenly sense the presence of a powerful monster that will eat your face, maybe you should run," unlike other [=RPGs=], ''Etrian Odyssey'' '''means''' it. It's worth noting that each round of combat counts as a step for F.O.E. movement, so taking too long will allow them to sneak up on you and join in the fight. All of this is on top of the [[NintendoHard already significant difficulty]] of the rest of the game.

According to the series' original scenario designer, Shigeo Komori, the series was inspired by retro dungeon crawler games, specifically ''VideoGame/DungeonMaster''. He lamented that no one made games like that anymore, and designed ''Etrian Odyssey'' in the hopes that it would catch enough interest to revive the genre. While the series wasn't an overnight success, the first game managed enough sales to warrant a sequel and by the time ''Etrian Odyssey IV'' rolled around, its first week sales in Japan pulled over 100,000 units. The series has become a sort of cult hit internationally, and is definitely one of Atlus' staple franchises at this point - to the point that [[VideoGame/PersonaQShadowOfTheLabyrinth an Etrian-mechanics-inspired Persona game]], featuring the casts of the modern Persona games, was released in 2014 (staggered worldwide, to boot). The series will also get a themed {{crossover}} game within the Chunsoft's {{Roguelike}} ''Mysterious Dungeon'' [[note]]Fushigi no Dungeon[[/note]] franchise set to release in 2015.

The series has a '''[[Characters/EtrianOdyssey character page]]''' that could use some work.

For similar games to compare and contrast, see the UrExample, ''VideoGame/{{Wizardry}}'', and/or the main-series ''Franchise/ShinMegamiTensei'' games, including the spinoff ''VideoGame/ShinMegamiTenseiStrangeJourney.'' Also compare ''VideoGame/PersonaQShadowOfTheLabyrinth'', which is essentially an ''Etrian'' game with a ''Persona'' spin on the visuals, settings and a few mechanics.

!!The games in this series include:
* '''''Etrian Odyssey''''' [[note]]Known as ''"Sekaiju no Meikyuu"'', lit. "''Labyrinth of Yggdrasil''" in Japan[[/note]]({{Nintendo DS}}, 2007)
* '''''Etrian Odyssey II: Heroes of Lagaard''''' [[note]]Known as ''"Sekaiju no Meikyuu II: Shoou no Seijai"'' in Japan[[/note]]({{Nintendo DS}}, 2008)
* '''''Etrian Odyssey III: The Drowned City''''' [[note]]Known as ''"Sekaiju no Meikyuu III: Seikai no Raihousha"'' in Japan[[/note]]({{Nintendo DS}}, 2010)
* '''''Etrian Odyssey IV: Legends of the Titan''''' [[note]]Known as ''"Sekaiju no Meikyuu IV: Denshou no Kyojin"'' in Japan[[/note]]({{Nintendo 3DS}}, 2012)
* '''''Etrian Odyssey Untold: The Millennium Girl''''' [[note]]Known as ''"Shin Sekaiju no Meikyuu: Mireniamu no Shoujo"'' in Japan[[/note]]({{Nintendo 3DS}}, 2013)
* '''''Etrian Odyssey 2 Untold: The Fafnir Knight''''' [[note]]Known as ''"Shin Sekaiju no Meikyuu 2: Fafuniiru no Kishi"'' in Japan[[/note]] ({{Nintendo 3DS}}, 2015)
* '''''Etrian Mystery Dungeon''''' [[note]]Known as ''"Sekaiju to Fushigi no Dungeon"'' in Japan[[/note]], a {{crossover}} with the ''Mystery Dungeon'' series ({{Nintendo 3DS}}, 2015)
* '''''Sekaiju no Meikyuu V''''' [[note]]Etrian Odyssey V[[/note]], teased, system and release date TBA.
----
!!This series provides examples of:
* AbandonedLaboratory: The [[spoiler:Hall of Darkness]] in ''Legends of the Titan''.
** ''The Millenium Girl's'' Gladsheim, as well.
* AbsurdlyHighLevelCap: While the level cap starts at 70 (like in the first game) in ''Heroes of Lagaard'', this can be raised. The condition is to raise your character to level 70, then retire them (which raises the cap by one level), and keep repeating the cycle until they reach level 99. [[note]]That means you need to retire a character at max level 29 times, with the character earning '''55 levels''' on average, for every cycle.[[/note]] But after reaching level 99, for best results, you would need to retire your character one last time so it can reach maximum stats. Thus, for your starting party to reach this perfect cap, you need to gain 1733 levels per character. Makes you wonder if they take a cue from ''Franchise/{{Disgaea}}''. Fortunately, all games afterwards decided to forego this and instead have you raise the level cap by beating the [[BonusBoss three dragons]].
* AchievementSystem: The 3DS games have several tracked accomplishments for you to shoot for. The common ones include entering a strata for the first time and uncovering a certain amount of item and monster logs.
* ActionBomb:
** A few enemies in ''The Drowned City'', but most notably the [[MetalSlime Pasaran]].
** A Flame Rat in ''Legends of the Titan'' can be one if when paired with a Flame Lynx.
* ActionGirl: On top of having two female portraits for each character class (and a few [[DudeLooksLikeALady who could easily pass for one]]), official art prefers showcasing women. Each game uses a woman as its representative or mascot:
** ''Etrian Odyssey'' uses the blonde Protector.
** ''Heroes of Lagaard'' uses a blue-clad Gunner with the [[Franchise/ShinMegamiTensei Jack Frost]] hairclip.
** ''The Drowned City'' uses the ponytailed Princess.
** ''Legends of the Titan'' uses the short-haired Landsknecht and the pigtailed Fortress - in a much, ''much'' more prominent fashion than the previous examples. See two tropes below.
** ''Untold'' has Frederica, naturally.
** Ariana would continue the trend into ''The Fafnir Knight'', but the main character lending his name and image to the game got in the way.
* AdamSmithHatesYourGuts: One of the many, things that makes these games hard is just how much basic goods and services can cost.
** ''The Drowned City'' cuts the price of revival items by 90%, just 50en! There's a catch. The past games only require materials for unique weapons, but in this game ALL unlocked items rely on raw materials. Even basic medicines require item farming.
*** ''Legends of the Titan'' keeps this system, mostly. The starting shop items just require cash.
* AdventureDuo: The bob-cut Landsknecht and pigtailed Fortress of ''Legends of the Titan'' are portrayed this way in promotional art - the ''only'' time you might see one without the other is on the Japanese soundtrack covers. Otherwise, not only are they everywhere, but they are '''always''' used together. And even in proper Adventure Duo fashion - the Landsknecht is usually being a fairly sensible Hero while the Fortress is often posed a little more dynamically or is doing something goofier (perfect example: the back of the American art collection booklet).
* AfterTheEnd
** ''Etrian Odyssey'' is set up as AfterTheEnd in the pre-title intro, which establishes that an apocalyptic disaster ended a previous enlightened age; however, the exact nature of the world '''Before''' the end is the biggest twist in the game.
** ''Heroes of Lagaard'' takes place on the same world. The game also revolves around the aftermath of the same disaster.
** In ''The Drowned City'', it is quickly established early on that a much more recent 'Calamity' (one hundred years ago as opposed to 1000) destroyed Armoroad's original prosperity.
** The Sixth Labyrinth in ''Legends of the Titan'' goes a long way towards explaining exactly why no one in Tharsis knows much of anything about the lands to the north. [[spoiler:Spoiler alert, it involves ecological disaster of apocalpyptic proportions.]]
** It's finally spelled out in ''The Millennium Girl'' that the disaster of 1000 years ago is ('''major spoilers''') [[spoiler:[[EarthAllAlong our world's ecological collapse]]. The Yggdrasil Project was initiated to stop it, but there's a side effect: the COMPLETION of the project causes Yggdrasil's core to go berserk, since it no longer has contaminants to feed on. There are also ''seven of these''.]]
* AIBreaker: Provoke in ''Etrian Mystery Dungeon''. If there's anything - including a member of your party - in between an enemy and the Protector, it won't attack if it doesn't have any ranged attacks to directly attack the unit with Provoke, instead just moving back and forth fruitlessly.
* AIIsACrapshoot: [[spoiler:M.I.K.E. goes insane after the party confronts him about activating Gungnir. It eventually leads to him trying to activate Gungnir anyway despite not meeting the requirements to actually kill the core. However, after he is defeated and talks to Frederica, he believes in the party and uses all spare energy he has to assist them.]]
* AKindOfOne: all three games contain straight examples as well as aversions.
** The Japanese version of ''Etrian Odyssey'' feature ''Gullinburstis'' in the 5th stratum, though they were renamed during localization. Both versions of the remake retain the original name.
** ''Heroes of Lagaard'' has the player battling ''Sleipnirs'' (and yes, they all have 8 legs)
** Most bosses are actually aversions, including types of monsters that are normally AKindOfOne in other games (like fenrir wolves or chimerae)
* AlternateContinuity: For a time it was unclear if this applied - ''2'' continued directly from ''1'', but ''3'' and ''4'' seemed like they could be their own little worlds - but the ''Untold'' games, ''Fafnir'' especially, have made it crystal clear that every single Etrian game to date and probably to come takes place in the same setting. [[spoiler:This setting is [[EarthAllAlong our own planet]], a thousand years-plus from now, following ecological collapse and attempts to prevent it - the Yggdrasi.]] The only remaining question mark is ''Etrian Mystery Dungeon'', due to its spinoff nature, and even then it makes mention of the other games.
* AlchemyIsMagic: Alchemists fill the Black Mage role and serve as the major source of elemental damage.
* AmbiguouslyGay: A bit milder than some other examples, and of course the series practically ''encourages'' you to write your own head-canon, but some of the art of the aforementioned ''[=EO4=]'' AdventureDuo comes across this way. The bit at the very end of the "Music and Art Collection" booklet (the one behind the CD) turns the most heads in this regard, but in general they're depicted doing a ''lot'' together - straight down to grocery shopping and eating meals. If they aren't the trope, they're at least HeterosexualLifePartners.
** It doesn't help that some of the personal artwork of Yuji Himukai, the series' lead artist, "pours fire" on the speculation... to put it ''mildly''.
* AnAdventurerIsYou: YOU are the brave adventurers going on an epic journey into a vast labyrinth of mystery and wonder.
** [[EverythingIsTryingToKillYou And monsters. Don't forget the monsters]].
* AndTheAdventureContinues: The ending of the Story Mode in ''The Fafnir Knight'' has [[spoiler:Arianna, Flavio, Chloe and Bertrand heading south to Armoroad to look for the Fafnir Knight.]]
* AntiFrustrationFeatures: While getting a GameOver will erase all other progress since you last saved, changes you've made to your map can still be saved.
* ArbitraryHeadcountLimit: The original series designer/director actually admitted in an interview that he set the party limit to five to ensure that players would always feel like they're missing out on the benefits of whatever class they're not using -- with six or more, parties were just too complete.
** In ''The Drowned City'', however, you can summon monsters or make a clone of a character to fill the sixth slot. ''Legends of the Titan'' includes a sixth slot for guests, but removes the ability to fill the sixth slot using a skill.
* ArtEvolution: The character designs have grown increasingly complex over time, going from what might be described as "generically anime" and not involving a lot of detail or complex colors, to having a very distinct, detailed kind of "PuniPlush" style that involves a lot of complex use of color and gradients, with very elaborate clothing that is usually European-inspired. This is most easily seen in the ''Untold'' games, where the original art from the DS games and the new art can be compared side-by-side.
* ArtifactTitle: Only the first game and the remake takes place in Etria. The second, third, and fourth take place in Lagaard, Armoroad, and Tharsis, respectively. The Japanese titles are different (''Yggdrasil's Labyrinth'' or ''Labyrinth of the WorldTree''), which makes sense even though the eponymous tree in each game is completely unrelated to the others.
* ArtificialBrilliance: Some beetle enemies in both ''Legends of the Titan'' and ''The Millennium Girl'' will sometimes guard an enemy when they themselves are at low HP. Not only will they not move normally if they did anything else due to being too slow, but they would also prevent you from slamming a healthy enemy with a powerful attack, or preventing an ability that requires a certain character to kill an enemy from activating. This is used to strategic effect in the former game, as there are enemies in the Hall of Darkness that react angrily to other enemies being killed.
* ArtificialStupidity: Enemies may try to use skills that won't work due to the required body part being bound, giving you a free turn.
* AttackItsWeakPoint ForMassiveDamage: Played straight in all of the games, but generally not so noticeable in ''Etrian Odyssey''. Most enemies have an element they are weak to, and receive about 50% more damage from an attack of that element.
** The mage-like classes from the second game on have skills all further increase the damage you do when you hit a weakness. Alchemists have Analyze in ''Heroes of Lagaard'', Zodiacs have Singularity in ''The Drowned City'', and the Rune Masters have Runic Guidance in ''Legends of the Titan''. Analyze also returns for ''The Millennium Girl''.
* AwesomeButImpractical:
** The InfinityPlusOneSword and InfinityMinusOneSword weapons in ''Legends of the Titan''. They're only slightly more powerful than the third most powerful weapon of its type. However, the killer is that despite having a full six/eight forge slots, they require one of each material used to make the weapon to be used for ''a single slot''. This is a problem because the items are either normal or conditional drops from difficult bonus bosses or ''the sixth stratum's super difficult boss''. Especially since the bosses take a lengthy fourteen days to respawn after they're defeated.
** Also from ''Legends of the Titan'', Blood Surge is initially very practical, but becomes this after putting more than one or two skill points into it. At one point, it boosts your damage by 45% in return for costing 10 HP and 5 TP every turn. Further points give a 5% increase to the damage bonus, but a ''much'' higher increase to the [[CastFromHitPoints HP cost]]. Maxed out at six points, it becomes +70% damage for ''197'' HP and 10 TP per turn.
** Tagen Battou in ''The Drowned City''. While it's capable of defeating the bonus boss in a single hit, getting the full power of the attack requires multiple turns of set-up and requires you to have multiple open slots in your party, which is a ''terrible'' idea.
* AwesomeByAnalysis: Alchemists have the skill Analysis, which increases their damage when they attack enemies' weak points. The Zodiac class supposedly uses the power of math to manipulate the ether.
** Analysis became a Burst skill in ''Legends of the Titan'', where it reveals all information of the scanned target.
* AwesomeMcCoolName[=/=]NamesToRunAwayFromReallyFast: The elephant your Wildling summons is named "Plague God".
* BadassAdorable[=/=]LittleMissBadass: Some of the female adventurers look ''very'' young. ''The Drowned City'' continues the tradition and has {{Gender Flip}}ped it, with a few male designs that tread into shota territory.
** According to the "Explorer's Log" comics by character designer Yuji Himukai, the "representative" Hexer (the girl with the pale lavender hair) in the first two games is all of ''[[http://etrian.wikia.com/wiki/File:EO1ExplorersLog9%28Hexer%29.png twelve years old]]'' at the start of ''Etrian Odyssey''. (Funnily enough, though, the female Protector, who is the nearest thing to a main character ''[=EO1=]'' has, is apparently [[http://etrian.wikia.com/wiki/File:EO1ExplorersLog1%28Protector%29.png in her mid-twenties]] when most people would peg her younger.)
* BadassPrincess: The character class in ''The Drowned City'' as well as one of the main characters of Knight of Fafnir.
* BagOfSharing
* BarrierWarrior: Protectors and Fortresses, while mainly acting as StoneWall, have skills that can completely block certain elemental attacks or improve defense for the entire party. In ''The Drowned City'', several classes have the ability to put up barriers (which, if barriers are necessary to begin with, will likely be all they do for the entire battle).
* BattleBallgown: The Princess and Hoplite classes in the third game.
* BearsAreBadNews: In ''Legends of the Titan'', the F.O.E.s in the first big dungeon are Cutters. Later in the dungeon come their nastier cousins the [[NamesToRunAwayFromReallyFast Bloodbears]], and said dungeon ends with an even more ferocious one called the Berserker King. [[spoiler:And the portions of the final dungeon that weave through the first dungeon feature Desoulers, an F.O.E. that makes the prior three look tame by comparison.]]
** They also appeared in ''Etrian Odyssey'', and return in ''The Millennium Girl''.
* BeefGate: This is one purpose of the F.O.E.s. Special cases above and beyond even that that are mentioned as such even in game include [[spoiler:Wyvern]] in ''Etrian Odyssey'', [[spoiler:Salamox]] in ''Heroes of Lagaard'', and [[spoiler:the Stalkers]] in both games.
* BerserkButton: In ''Untold 2'', Salamander (previously Salamox) will go nuts and start spamming its ultimate attack every turn [[MamaBear if you kill any of the Baby Salamanders it summons]].
* BenevolentBoss: A lot of the town leaders are decent, but worth noting is the Outland Count from ''Legends of the Titan''. He at first comes across as a pampered aristocrat with his fancy outfit and his fluffy lapdog, Margherita. It quickly becomes apparent, however, that he has a very good understanding of the responsibility that comes with his position and he would gladly give anything, even his own life, to protect the city.
* BittersweetEnding: In ''Heroes of Lagaard'', [[spoiler:The Overlord is defeated, thus freeing High Lagaard from his insane experiments, but the Birdmen are now left with the reality that their "god" was in fact a fraud, and their leader admits that his people's future is uncertain. Also, the Overlord's death unleashes the [[EldritchAbomination Ur Child]], but the Guild deals with that in the postgame.]]
** In ''The Drowned City'', [[spoiler:both the Armoroad and Deep City endings are this. In both routes, the FinalBoss begs you to protect the world in their place, and to tell their sibling they are sorry before dying, your party is left wondering if they chose the right side after all, and Yggdrasil points out that the true enemy, the Abyssal God, is still out there.]]
* BizarreSexualDimorphism: In ''The Drowned City'', female Deep Ones are far more humanoid (basically resembling mermaids with claws and inhuman skin colors) than the males (FishPeople).
* BlackoutBasement: A few areas on the second and third floors of the Hall of Darkness in ''Legends of the Titan'' feature pitch black rooms with teleporter traps on the floor. [[spoiler:In actuality, the safe places to walk coincide with the patches of poison on the floor in the adjacent rooms.]]
** A couple floors in ''The Millennium Girl'' start out with very little lighting, and you have to either light torches, therefore waking up the F.O.E.s, or carefully see one step ahead of you. [[spoiler:[=B27F=]]], however, gets special notice for [[spoiler:retaining the large amount of pits on the floor]] like in the original, having an [[FromBadToWorse already difficult floor]] be cranked UpToEleven. [[SarcasmMode Fun]].
* BlatantLies: If you use the password system in ''Heroes of Lagaard'', it's stated multiple times that [[spoiler:your guild saved Etria. This is completely false, as your guild ''killed'' their Yggdrasil by killing the only thing keeping it alive, and potentially turned it into a ghost town. Though this was fixed with ''The Millennium Girl'', as Etria's Yggdrasil (as well as Gungnir) would have wiped a large portion of civilization off the map if your party hadn't intervened.]]
** The bear F.O.E.s in the fifth stratum in ''The Millennium Girl'' are weaker than the mantis on the same floor, according to the minimap. The bears also have a random, heavy-hitting attack that can wipe out your party in a single turn, even with buffs and debuffs added, which is far more than a mantis can do.
*** In the same game, some skills have deceiving descriptions. For example, Stone Gleam says it targets a line, while it really only targets a single person/enemy. Forest Barrier reduces defense and Forest Breach reduces attack, despite the names making more sense the other way around. When the party healing skill Salve is at level 9, the "next level" descriptor in the Custom screen says it will target all '''enemies''' at level 10. Allied Bonds says it recovers HP when party members in the same line sacrifice their HP, but it actually recovers '''T'''P. The text in cutscenes also occasionally has typos.
*** There are also a few Grimoire effects guilty of this as well. One such notable example says that new Grimoire Stones will be at double the level of the original... but it actually increases the level of abilities on equipped Grimoire Stones by 2.
* BlindIdiotTranslation: While the games are mostly good about avoiding this (bar a few errors in the Untold games, primarily with skill effects such as those listed above), ''Heroes of High Lagaard'' and ''The Fafnir Knight'' have an issue with German. Namely, Wilhelm refers to himself as Der Freischütz in the original, when it should be Freischütze. The remake makes it even worse by making it Das Freischutz instead.
* BlingOfWar: A quest giver in ''The Millennium Girl'' is obsessed with gold, and has you fetch him golden horns (to decorate his house) and hide (to make himself a gold coat), and rewards you with literal gold armor - which has terrible defense (as can be expected of armor made of soft metal) but offers other bonuses when worn.
* BlushSticker: The girls in ''The Millennium Girl'' have this in the cutscenes. It's otherwise absent, however.
* BodyHorror: The Titan's Curse in ''Legends of the Titan'', which appears partway through the third land. [[spoiler:It slowly and painfully transforms its victims into vegetation.]] While discussed and described at length, its effects are almost never shown [[spoiler:with the exception of Prince Baldur, who takes on a OneWingedAngel form thanks to the tree's effects]].
* BonusBoss:
** It says something that a game that was already NintendoHard felt the need to kick it up a notch for the post-game content. Three of them in particular have been in all the games: the [[PlayingWithFire Wyrm]], the [[AnIcePerson Drake]], and the [[ShockAndAwe Dragon]]. They were renamed to Great Dragon, Blizzard King, and Storm Emperor in ''Legend of the Titan'' onward.
** The third game adds another dragon to the mix, [[spoiler: the Elder Dragon]], who, being the one who had the quests for them unlocked in the first place, proves to be even harder than the aforementioned three!
** The fourth game brings in a fifth dragon, [[spoiler:[[NamesToRunAwayFromReallyFast the Fallen One]]]], who is implied to be the fourth's dragon's counterpart, and it shows with its abilities.
** Each game also has a 'superboss' that dwells at the final floor of the entire labyrinth, and these tend to be stronger than everything else in the game. There is [[spoiler:Primevil/Yggdrasil Core]] in the first game and its remake, [[spoiler:Ur-Child]] in the second game and its remake, [[spoiler:the Abyssal God]] in the third game, and the [[spoiler:Warped Savior]] in the fourth game. ''The Fafnir Knight'' takes this UpToEleven by introducing a DLC boss that is fought on the labyrinth's 31st Floor and is even stronger than the [[spoiler:Ur-Child]].
* BonusDungeon: Every game in the series features a sixth (or seventh, in the case of the Untold games) stratum that houses much harder enemies and a powerful BonusBoss.
* BoringButPractical: Making detailed maps can take quite a while, but since the nature of the game makes it so that you have to run through the same floors over and over it pays off when you're able to get through the first Strata in a few minutes.
* BossInMookClothing: While F.O.E.s are sometimes considered this by new players, you can choose when you want to fight them. However, many random encounters are just as deadly.
** ''Heroes of Lagaard'' has a returning enemy from the first game, the [[spoiler:Muckdile]], who traded its not-very-noteworthy F.O.E. status for a '''deadly''' rare random encounter. [[FromBadToWorse Along with many factors that make it more formidable, it's the single enemy in the game that is immune to Stun, and uses an extremely dangerous attack if you bind its limbs.]] Not even the final BonusBoss does anything like that, and there is no way to know it until it has happened at least once.
** ''The Drowned City'' has a couple. The Great Lynx, on the first floor, has been known to kill party members with normal attacks. Largebills are a stronger version, though they teach players to go dungeon-hopping during certain hours. These seem to be a giant middle finger at anyone who's trying this series for the first time. Of course, as you go down, things will [[FromBadToWorse get worse]]. And this happens at every stratum in the game. The worst kinds, however, are the monsters that summon/combine/transform to ''F.O.E.-type'' monsters if left alive for too long.
** Practically any ape monster qualifies in ''Legends of the Titan''.
* BottomlessBladder: You never need to sleep, and one quest in ''Etrian Odyssey'' requires you avoid doing so for 5 days. There isn't really that much reason to sleep, with an easily obtainable source of infinite TP on the first floor and the cost of the inn.
* ButThouMust: The first game forces you to follow through with the mayor's plans to genocide the forest people in order to proceed (you can't continue until you accept his mission to annihilate them.) And to make it worse, he explicitly says that he's doing it to protect the town's ''tourist industry''.
** After you defeat the boss in ''Heroes of Lagaard'''s Crimson Vengeance postgame quest, you have one of three responses for [[spoiler:the Guildmaster after you save her]]. Only one of the responses will actually allow you to proceed, mainly to [[spoiler: prevent her from resigning and leaving Lagaard]].
* BrainwashedAndCrazy: In ''The Millennium Girl'', [[spoiler:Visil is taken over by the Yggdrasil Core, though he manages to snap out of it shortly before his death.]]
* CanadaEh: ''The Millennium Girl'' doesn't try to hide that Raquna is Canadian. She comes from a cold area north of Etria that has wonderful maple syrup, and adds "eh?" to some of her sentences. Her home city? [[spoiler: Ontario]].
* CastFromHitPoints: The Bushi's Blood Surge skill in ''Legends of the Titan'' boosts the user's attack power considerably but consumes a portion of HP and TP with each action made while the skill is active, and their Shockwave skill that hits every enemy consumes 25% of their max HP. A good number of the Highlander skills in ''The Millennium Girl'' require you to sacrifice some HP for an attack. Much like Shockwave, the health sacrificed is a percentage of your current HP.
* CensorSteam: Shin, one of the possible fourth stratum bosses in ''The Drowned City''.
* CognizantLimbs: In ''Legends of the Titan'', [[spoiler:the [[FinalBoss Heavenbringer]] is supported by its two arms. The [[BonusBoss Warped Savior]] then one-ups it with two claws ''and'' two buds.]]
* ColorCodedForYourConvenience: F.O.E.'s come in orange (normal, follows a set path), red (strong, and will actively pursue you), blue (flying), purple (invisible on the map), black (bosses) and, as of the third game, gold (essentially [[MetalSlime MetalSlimes]]).
** In ''Legends of the Titan'' and ''The Millennium Girl'', while F.O.E's use their own model on the field, they now have a colored aura around their icon on the map indicating their strength. Blue means you can likely defeat them easily, yellow means that you can manage them, but proper planning is a must, and red means "run!". Purple is reserved for bosses.
* CombatMedic: A counter-intuitive offensive build of a Medic can result in a surprisingly potent front-line fighter. The damage is subpar at best, but Caduceus will turn everything you touch into stun.
** The Monk class from ''The Drowned City'' takes this even further. He can use Qi to heal his allies, and his muscles to pummel the enemy from the front lines.
** Depending on subclass choices, a Medic can also make a decent fighter in ''Legends of the Titan''. Most people tend to favor the abilities Knockout Blow and Star Drop.
* ContinuingIsPainful:
** In the early parts of the first two games, revival items are expensive, and Medic is the only class that learns Revive. Even then, Revive is an expensive spell, and doesn't become available until you've invested quite a few skill points to acquire it--if you even decided to use a Medic at all. This means that in the early game, the death of any party member essentially requires you to cut your dungeon crawl short to visit the hospital. ''The Drowned City'' goes easier on the player, as the revival items are much less expensive. Sadly, they're also "limited supply" items - the store's supply is limited to the amount of certain drops that you've sold them.
** While healing is much easier in ''Etrian Mystery Dungeon'', the consequences for death are made much more dire. If your party is wiped out, you lose all your gold and items in your inventory. If you let a D.O.E. reach the surface, it will destroy one of the town's buildings, rendering you unable to use it for a while. And if one of your party member dies, the monster you were fighting evolves into a more powerful form. To top it all off, the game autosaves when you enter a dungeon to prevent you from save-scumming.
* ContractualBossImmunity: Played with in some cases, averted in others. Most bosses do possess immunity to attacks that would one shot them, emphasis on 'Most'. Some bosses and FOE's can only give their special drop this way. Almost none are immune to any form of Bind, and status effects can mean the difference between victory and defeat with some of the more powerful enemies.
* CrazyPrepared: You. That's right, ''you.'' Honestly now, how many warp wires are you carrying on you at all times? Yeah, I thought so.
* DeathIsASlapOnTheWrist: ''Legends of the Titan'' makes a full party KO a true slap on the wrist on Casual difficulty by simply kicking you back to town. In a similar fashion, ''The Millennium Girl'''s Picnic difficulty lets your party continue when they're wiped out, though Standard difficulty will let them continue only once.
* DecoyProtagonist: Even ''The Millennium Girl'''s title tells you that the hero isn't the Highlander. Instead, it's Frederica.
* TheDevTeamThinksOfEverything: In ''The Millenium Girl'', guests [[spoiler:Ren and Tlachtga]] have lines recorded for some very unlikely occurrances on your first mission, including if the enemy flees, if they level up, and even if you get a Game Over, the latter two of which are difficult to have happen since they're so many levels ahead.
* DifficultButAwesome: Tagen Batou in ''The Drowned City''. In order to use it effectively, you need to have some spare slots in your party (something you don't want ''any'' of to begin with) and fill them up with clones. Since creating clones costs 10 TP and gives half your HP and TP to the clone, dying and/or running low on TP is a very real possibility. If you want even more power, subclassing your Ninja in Gladiator (or your Gladiator in Ninja) would allow them to use Berserker Vow to deal even ''more'' damage. However, if this is actually pulled off, it's capable of finishing off even the ''BonusBoss'' in a single use.
* DifficultyLevels: In ''Legends of the Titan'', there's Casual and Normal. Normal is the same as the other games, but Casual difficulty [[DeathIsASlapOnTheWrist warps your party back to Tharsis when they're all dead]], prevents certain items from being used up, and makes enemies easier.
** ''The Millennium Girl'' has Picnic, which seems similar to Casual difficulty but lets them continue on instead of warping them back to Etria, Standard difficulty, which lets the party continue on once, and Expert, which is close to the same difficulty of the original version.
* DiscOneNuke: If you know the conditional drop for a boss, or manage to save up a Formaldehyde in later games, you can unlock some pretty powerful equipment early in the game. The only obstacle from that point is the hundreds of thousands of En it costs to purchase it.
* DownerEnding: ''Etrian Odyssey'', with a healthy dose of NiceJobBreakingItHero for good measure. Once you've completely filled the codex by logging every single drop and enemy in the game, Subaltern Quinn comes to see you and offer recognition of your feat - which, he adds, will result in Etria eventually turning into a ghost town now that the Labyrinth no longer holds any mysteries to attract adventurers. The ending for beating the boss at the end of the fifth stratum also counts, since [[spoiler:killing that boss ''killed Etria's Yggdrasil''.]] Though this is fixed in ''The Millennium Girl''.
* DownloadableContent: ''The Fafnir Knight'' and ''Etrian Mystery Dungeon'' have additional content available for purchase. It consists of special quests, and ''The Fafnir Knight'' also has an additional class and extra character portraits.
* DrivenToSuicide: A possible curse the Hexer can do to a terrified enemy has it attack itself.
* DualBoss: [[spoiler:Ren and Tlachtga]] in ''Etrian Odyssey'' and ''The Millennium Girl'', [[spoiler:Artelinde and Wilhelm]] in ''Heroes of Lagaard'', and [[spoiler:Seyfried and Olympia]] in ''The Drowned City''.
* DualWield: The Shogun from ''The Drowned City'' have this as their Innate Class skill, trading one of their armor slots for a second weapon.
** ''Legends of the Titan'' plays this interestingly. All classes can equip two weapons; however, they don't automatically use both weapons to strike. Instead, they rely mostly on their 'mainhand' weapon, but can use the other for related weaponry skills. Only a couple of classes learn skills that enable them to use both weapons at the same time; otherwise, it's functionally more like ChoiceOfTwoWeapons or BowAndSwordInAccord.
* DubNameChange: Most classes have relatively mundane and plain names in Japanese, which are changed to something more distinctive in localization.
* DungeonCrawling
* TheDragon: [[spoiler:Ren and Tlachtga]] in ''Etrian Odyssey'', Colossus in ''Heroes of Lagaard'', and Kujura and Olympia in ''The Drowned City'' to their respective faction heads. [[spoiler:The Progenitor, despite being the TrueFinalBoss, is TheDragon to the Abyssal God.]] Logre serves [[spoiler:Baldur]] in ''Legends of the Titan''.
* EarlyGameHell: EO is especially difficult when your party is low level. The difficulty curve flattens out as your battle options expand.
* EarlyBirdBoss: A group of Venom Flies, on the first floor can act like this ''during the first quest''. They're normal enemies that are deadly to level appropriate adventurers, since they hail from the deepest parts of the next floor. You can avoid the encounter by picking the correct dialogue option, but otherwise...
** Sadistically reprised in ''Heroes of Lagaard''. Choose to transfer data from the first game and go to a similar point in the Ancient Forest, your party will recall being ambushed by Venomflies before the player is given a choice of whether or not to rest. [[spoiler:Saying no causes the battle.]]
* EldritchAbomination: The TrueFinalBoss[=/=]BonusBoss in every game. ESPECIALLY in ''Etrian Odyssey'', its remake, and ''The Drowned City''. [[http://img2.wikia.nocookie.net/__cb20120914033255/etrian/images/c/c4/PrimevilScan.png This... thing]] would make H.P. Lovecraft proud.
* EleventhHourSuperpower: In ''The Millennium Girl'''s Story Mode, [[spoiler:Kupala of the forest folk pulls a HeroicSacrifice]] in order for the party to have their weapons become strong enough to defeat it. That said, it does not make the boss easy for the unprepared.
* EmptyLevels: Some skills in the early games. For instance, the Boost Up skill from the first game only increases Boost's effect with every odd skill point (which makes this especially bad is that it's a 10 point level - the last point does nothing). Arm Heal is even worse, since it's also a 10 point skill, but only three of those ten levels do anything (and the later two levels just reduce the TP cost).
** Finally corrected in ''Legends of the Titan'' and ''The Millennium Girl'' - every skill level will either improve the strength of the ability, reduce its cost, or improve the success rate of the ability. Some abilities will increase in cost, but those are accompanied by larger increases in strength and/or success rate. However, [[BlessedWithSuck the improvement in strength and/or success rate isn't always worth the cost]].
* EncounterRepellant
* EnemyDetectingRadar: All games have this in the lower right corner of the screen. Blue and yellow mean you're safe, but red means it's time to get ready to fight. The radar also tells you when an F.O.E. is nearby; a F.O.E. within 3 squares from you pops out an extra bar with three stages to let you know when they're nearby or right behind you. Very handy in ''Heroes of Lagaard'' where some F.O.E.s don't show up in your map, and in ''The Drowned City'', since the fifth and sixth stratums have no-radar areas.
* EscapeBattleTechnique: Present in all three games. In the first two, the Protector can learn the Flee skill, which always escapes the party from any battle where they aren't trapped, and has a chance of dropping them at the last staircase they used. In the third game, the Ninja's "Tonsou Jutsu" skill does the same, but it's no longer a guaranteed escape (merely an increased chance), while the Shogun's [[ExactlyWhatItsaysOnTheTin "Retreat"]] skill simply takes you out of the battle.
* EveryoneLovesBlondes: Sort of. There are no real main characters for any of the games (Untold remakes notwithstanding), however promotional materials and assorted artwork for soundtracks, artbooks, etc. for the first three games heavily feature and highlight: for [=EO1=]- the blonde female protector, for [=EO2=]- the blonde female gunner (she actually shares heavy spotlight with the blonde Protector, as her class returns in [=EO2=]), and for [=E03=]- the blonde female Princess. This is averted in [=EO4=] which opts to heavily feature the bob-cut dark-haired female Landsknecht instead of any of the available blondes.
* EverythingsBetterWithPrincesses: ''The Drowned City'' not only offers the Prince(ss) class as a character class, but Princess Gutrune of Armoroad is a major player in the story, and some Sea Quests have Princesses from other lands join your party.
** ''Knight of Fafnir'' has a Princess in its Story Mode, and Princes/ses as a class in Classic Mode.
* EverythingTryingToKillYou: Even the first floor is torture. That stone you can sell? It's being guarded by a trio of powerful moles. That serene clearing where you can rest and regain strength? ''That's'' being guarded by a trio of ludicrously powerful poisonous butterflies.
* ExcuseMeWhileIMultitask: You can draw or edit the bottom screen map during battle or while in conversation.
* ExcusePlot: Sort of. The opening of ''Etrian Odyssey'' and ''Heroes of Lagaard'' are more or less "there's this labyrinth and this town built around it, and you're one of quite a few guys who wants to conquer the labyrinth for gold and glory and to solve its mysteries. Have fun." Things start happening about 3/4s of the way into the game. In a sense, the major plot twist is that there actually is one. ''The Drowned City'' is better about this.
** ''Legends of the Titan'' breaks this and has a plot throughout the game, though it starts off the same.
** Averted with the Story Mode in ''The Millennium Girl'' and ''Knight of Fafnir'', where the plotline of the original is expanded upon and spread out over the course of the entire game.
* {{Expy}}: The Highlander in ''The Millennium Girl'' is similar to Giulio from ''{{VideoGame/Gungnir}}''. Ranging from weapon choice, hair colour, [[spoiler:their ultimate weapon being Gungnir]], and their belief that true justice should be given to all. [[note]]Though the Highlander's vision of justice is ''very'' different than that of Giulio's vision.[[/note]] That said the Highlander [[spoiler:rejects Gungnir after learning that it's a FantasticNuke, whereas Giulio accepted it in spite of that fact.]]
** ''Etrian Mystery Dungeon'' gives us the Wanderer class. This class can't be anything ''but'' a blatant ShoutOut to Chunsoft's RogueLike series: VideoGame/ShirenTheWanderer,
* ExtendedGameplay: Each game has a stratum, several quests, and several bosses only available after the final boss.
* EyeScream: [[spoiler:Baldur]] in ''Legends of the Titan'', due to the Titan's Curse, has a vine growing out of the character's ''left eye''. [[GameplayAndStorySegregation This has no effect on his accuracy,]] however, and [[spoiler:he gets better after his defeat]].
* FanService: Some character designs are... [[{{Stripperific}} questionable]]. Male fanservice isn't skimped over, either. Check out the first male pirate in the third one. Now double back and realize he [[WalkingShirtlessScene isn't wearing a shirt under his vest.]]
** The Dark Hunter's whip skills are very obviously bondage themed. Their basic binding skills involve gags, cuffs, and shackles, and their final whip skills are "Climax" and "Ecstasy." The Dark Hunter portraits kill any chance that this might [[NotWhatItLooksLike not be what it sounds like]]. Acknowledged by the developer in the [[http://www.atlus.com/etrian/img/comic3.gif Etrian Odyssey comic]].
*** The enemies are not spared either. Some humanoid enemies wear nothing but GodivaHair and CensorSteam. Might be FetishRetardant as many of these monsters have massive tentacle monster bodies below the torso.
** ''Knight of Fafnir'' has a [[HotSpringsEpisode hot springs]] [[DownloadableContent quest DLC]], which includes special portraits for Arianna and Chloe. They're exactly what you'd expect.
* FantasticNuke: [[spoiler:Gungnir]] in ''The Millennium Girl''.
* FeaturelessProtagonist: Your characters are blank slates. You get the [[ExcusePlot implied backstory]] that you're a guildmaster signing up recruits, which presumably means they're all wannabe-adventurers looking for work. Each class has four portraits, two per gender, though it's [[DudeLooksLikeALady not always obvious which is which]] (1 and 3 are male, 2 and 4 are female). That's all the game gives you, and none of it effects the gameplay. [[HelloInsertNameHere There isn't even a default suggestion for their names.]] The tutorial invites you to imagine that your guildmaster/you as one of the adventurers, but that isn't followed up upon.
** ''Legends of the Titan'' shakes this up a bit. Other classes unlock during the game, just like in other games, but [[spoiler:major NPCs can ''join'' the party as regular player units with the right dialogue options.]] You're still welcome to recruit anonymous schlubs, of course.
** Averted with the Story Mode main characters in ''The Millennium Girl'' and ''Knight of Fafnir''.
** ''Etrian Mystery Dungeon'' uses the guildmaster-as-adventurer idea more explicitly: you're forced to make a Landsknecht as your first character, and they must run through a trial dungeon to earn the right to form a guild. You're free to delete them immediately afterwards if you so choose.
* FetchQuest: Most quests involve going and finding something in the Labyrinth.
* FightingYourFriend: The [[spoiler:Demi-Fafnir]], aka [[spoiler:Bertrand]] in ''The Fafnir Knight.''
* FightWoosh: One for every stratum. When a battle starts, there's a rustling of leaves followed by blackened branches styled after the particular stratum covering the screen.
* FiveManBand: The classes broadly can be assigned to the five standard party slots.
** TheHero: The Landsknecht. The long-haired female Protector is sometimes put into this "role" too, given how often she shows up in artwork.
** TheLancer: The Survivalist and the Dark Hunter.
** TheBigGuy: The Protector and Ronin.
** TheSmartGuy: The Alchemist, Medic and Hexer.
** TheChick: The Troubadour.
** ''The Drowned City'' gives us:
*** TheHero: The Prince/Princess.
*** TheLancer: The Buccaneer and the Ninja.
*** TheBigGuy: The Gladiator, the Hoplite, and the Arbalist.
*** TheSmartGuy: The Monk, the Zodiac and the Wilding.
*** TheChick: The Farmer. Yes, even the guys.
*** TheSixthRanger: The Shogun and the Yggdroid.
** ''Legends of the Titan'' gives:
*** TheHero: The Landsknecht.
*** TheLancer: The Sniper and the Nightseekers. The blond pig-tailed Fortress counts as this for the AdventureDuo.
*** TheBigGuy: The Fortress and Bushi.
*** TheSmartGuy: The Medic, Rune Master, and Arcanist.
*** TheChick: The Dancer
*** TheSixthRanger: The [[spoiler:Imperial]].
** ''The Millennium Girl'' has:
*** TheHero: The [[HelloInsertNameHere Highlander protagonist]].
*** TheLancer: Raquna.
*** TheBigGuy: Arthur.
*** TheSmartGuy: Simon.
*** TheChick: Frederica.
** ''Knight of Fafnir'' has:
*** TheHero: The [[HelloInsertNameHere protagonist]].
*** TheLancer: Flavio.
*** TheBigGuy: Bertrand.
*** TheSmartGuy: Chloe.
*** TheChick: Arianna.
* FlavorText: Found in all of the beastiary entries and most item descriptions.
* FlyingSeafoodSpecial: Lots of monsters. Cotrangl/Corotorangul in ''Etrian Odyssey'' and ''The Millennium Girl'' are a boss examples. Many, many more come from ''TheDrownedCity''. Narmer, Ketos, Cruel Roamer, and Hammerhead...
* FlunkyBoss: The first stratum boss in every game sees the boss try to involve weaker F.O.E.s in the fight somehow. In ''Etrian Odyssey'' [[WolfpackBoss wolves]] spawn behind Fenrir and provide a constant stream of reinforcements until he's killed. There's also the Ant Queen of the third stratum. The fourth stratum boss is particularly sadistic about this; it's functionally immortal until all of the F.O.E.s on its floor are defeated. Leave and they ALL come back.
** In ''Heroes of Lagaard'' a pack of Slaveimp F.O.E.s spawned as soon as you entered the chamber, and start moving to join the battle when you fight Chimaera, unless you use a Lure Bell to draw them to you and beat them down before hand.
** In ''The Drowned City'', Narmer will run away in the middle of the fight and spawn a swarm of F.O.E.s you have to either defeat or maneuver around in order to confront him again and finish him off.
** The Berserker King of ''Legends of the Titan'' has a pair of bear buddies who must either be tediously and probably resource-intensively fought down individually (and even then, it's willing to come help ''them'') or they'll add into the fight with the boss. [[spoiler:You can use one of the bears to open a passageway which leads ''behind'' the boss; not only can you ambush him, but the bears don't add in when you have the Berserker King between you and them.]]
*** ''Legends of the Titan'' gets a straighter example with the Hollow Queen, who first summons a line of Hollow warriors, then a line of Hollow spellcasters after you kill the warriors.
* ForMassiveDamage: ''The Drowned City'' has an example which can almost be considered a GameBreaker. The Shogun class can attack once for every attack by another character. Buccaneers have an ability to attack multiple times a turn, and can be doubled with the Shogun's DualWielding ability. Give the [[InfinityPlusOneSword best weapon]] in the game to the chasing Shogun, as well as all your best attack buffs and damage-increasing equipment. With the Shogun chasing a team of multi-attacking, dual-wielding pirates, nearly any boss could crumble in a single turn.
** A character with Tagen Battou, with the right buffs, attack power, and weapons, are even more so when there are four or more copies.
** The entire point of [[spoiler:the Imperial class]] in ''Legends of the Titan''.
* FourIsDeath: Every four turns [[spoiler:the Elder Dragon]] from ''The Drowned City'' uses an attack that deals in the upward ''thousands'' unless you have its head bound. Thankfully, it doesn't suffer from binding decay like every other enemy in the game.
** Its ''Legends of the Titan'' counterpart, [[spoiler:the Fallen One]], has the same attack and uses it every four turns, but binding decay is present.
** ''The Millennium Girl'''s Blizzard King, on every fourth turn, will use a powerful counter if it's attacked.
** Also in ''The Millennium Girl'', Coeurl will use a powerful, party-wide attack every four turns before anyone can act, outside of skills such as Front/Rear Guard.
* GameplayAndStorySegregation: In the original ''Etrian Odyssey'', your party will [[spoiler:commit genocide, kill the leader of a town, destroy a tree meant to restore life to the Earth, and ruin a town's economy.]] You are lauded as heroes in the second game, regardless.
** In ''The Millennium Girl'', Arthur will complain about getting his formulas wet in the third stratum, even if you change his class to something else.
** In ''The Fafnir Knight'', a soldier identifies Chloe as a War Magus and asks her to heal his unit, even if you've reclassed her. She also says that she can only apply first aid, even if she's reclassed to a Medic and learned Cure and Revive.
* GenreBusting: Wizardry-style DungeonCrawler to the core, with the graph paper mapping built in. Since the third game, additional elements have crept in, like the Sea Chart movement puzzle, and the fourth game's overworld exploration.
* GetBackHereBoss: Narmer in ''The Drowned City'', probably the first boss that actually try to flee from the player instead of chasing the player as they usually do.
* GlassCannon: The Ronin and the Combat Medic from ''Etrian Odyssey'' and ''Heroes of Lagaard''. The Shogun from ''The Drowned City'' is an extreme example, toting skills further sacrificing defense for attack on top of their already weak armor. The Bushi in ''Legends of the Titan'' and the Highlander in ''The Millennium Girl'', while not particularly fragile, have a penchant for [[CastFromHitPoints losing HP every turn]].
* GoOutWithASmile: [[spoiler:Visil]] in ''The Millennium Girl''.
* GodzillaThreshold: Subverted twice in ''IV''.
** [[spoiler:Using the Heavenbringer was the Empire's last ditch attempt to restore life to their dying land, even if doing so would eliminate the vessels and sentinels. Subverted, in that the Heavenbringer wasn't viable long-term, since it would only buy a few decades.]]
** [[spoiler:The Hall of Darkness is home to the Warped Savior, an giant insect meant to destroy Yggdrasil in case it went out of control. The subversion here is that the failsafe was fed on Yggdrasil's power, and was corrupted just like Yggdrasil, and the lead scientist locked it away himself.]]
* GrailInTheGarbage: An early sidequest in ''IV'', tasks you with recovering armor used as collateral in a bargain; the merchant agreed since the armor was supposedly the work lesser genius. When retrieved, it's pretty much unusable, and the merchant will angrily write it off. A quick visit to the local blacksmith reveals that the armor was indeed created by said master, and is repaired for free!
* GratuitousGerman: Landsknecht. Wilhelm's nickname "Der Freischütz". There may be other examples.
* GreatBigLibraryOfEverything: The Midgard Library, the common thread between the Untold games. Simon, Arthur and Raquna investigate Gladsheim in ''The Millennium Girl'' on its orders. Arianna and ''The Fafnir Knight'''s protagonist come to Ginnungagap, causing the latter to become the titular creature.
* GreenHillZone: The first stratum in the first three games and remakes, and the first dungeons areas in ''Legends of the Titan''.
* GreyAndGreyMorality: ''The Drowned City''. [[spoiler:On one side, you have Princess Gutrude, a fair minded ruler who just wants to see her brother again, but has resorted to consuming Deep One flesh to prolong her life, mutating her and putting her at risk of becoming a Deep One herself, and falling under the Abyssal God's control. On the other side, you have Abyssal King Seyfried, the aforementioned brother of Gutrune who is fanatically obsessed with killing her due to her Deep One taint, but genuinely believes that its the only way to stop the Deep Ones' advance, and genuinely seeks to protect his former city.]]
* GuestStarPartyMember: ''The Drowned City'' has computer-controlled guest characters who you can fight alongside during sea quests. Amusingly, you're THEIR guest star, since they're the quest givers and you're helping them solve their problem.
** Unlike ''The Drowned City'', the guests in ''Legends of the Titan'' are player controlled. Representatives of three unlockable classes temporarily join your party on the boss floor. Leave the floor before you kill the boss, and they'll leave your party until you return, at which point they'll offer to join your party again.
** Kirjonen and Wiglaf in ''Legends of the Titan'' fight with you if you interact with them when their balloons are downed. They also offer to join you when you're battling [[spoiler:the Blizzard King and the Storm Emperor]], in the post-game. [[spoiler:Baldur]] makes the offer when you battle [[spoiler:the Great Dragon]].
** In ''The Millennium Girl'', [[spoiler:Ren and Tlachtga]] will join the protagonist for the first mission in Story Mode, and [[ATasteOfPower are at least thirty levels higher than him]].
** In ''The Fafnir Knight'', [[spoiler:Wulfgar]] hops aboard for your first time through the first floor in story mode. At level 12, he's [[ATasteOfPower stronger than the rest of the party]], but not as strong as the examples above.
** In the same game, [[spoiler:Hrothgar]] joins for the fight against the Chimaera in story mode. He's level 16, about equal level with the recommended level to fight the boss.
* GuideDangIt: In ''The Drowned City'', getting a certain ending requires ignoring a mission you have seemingly no reason to not pick up immediately, then backtrack an entire area to talk to a character you've only seen once before who, while essential to the story, has never been indicated to be able to actually (sort of) improve the current crisis.
** Want the king grimoires in ''The Millennium Girl''? If you're not insanely lucky, then get the number values on your guild card to match up, and take on a boss enemy. Even then, that only gives you a 30% chance of getting the grimoire.
* GunsAreWorthless: HELL no, gunners are capable of ludicrous damage from the back lines. In ''Heroes of Lagaard'', gunners essentially fill the role that Alchemists played in ''Etrian Odyssey''. Of course, they're still slow and squishy.
* TheGunslinger: Gunners.
* HeroWorshipper: The innkeeper's son in ''The Drowned City'', and Wynne from ''Legends of the Titan''.
* HungryJungle: ''The Drowned City'''s [[spoiler:Sixth Stratum]]
* IncrediblyLamePun: [[spoiler:B27 floor]] of ''Etrian Odyssey'' is subtitled "All that live shall succumb". Which becomes apparent to mean "If you can still get up and walk, you can still walk right into one of those invisible pits we're strewn all over the entire floor." And fall into the floor appropriately named "Explorers' Abattoir".
* [[IdleAnimation Idle Chatter]]: In ''The Millennium Girl'''s Story Mode.
* InsurmountableWaistHighFence: ''Heroes of Lagaard'' introduces a special type of wall that looks more or less like a waist-high pile of rubble. You easily look over the rubble-walls and see everything on the other side, but they still count as walls, and you absolutely cannot pass. The only actual gameplay-related difference is that blue F.O.E.s can walk on/through them. There are a couple side dungeons in ''Legends of the Titan'' with similar obstacles (including water that flying/aquatic F.O.E.s can just move over).
* InterfaceScrew: Several floors in the lower strata of ''The Drowned City'' include some areas where your radar is turned off. This means that the map screen does not show you where your party is going. Good luck memorizing the map. [[FromBadToWorse And to make matters worse]], the map does not show where the F.O.E.s are either, although at least you get to see the F.O.E. in your exploration screen.
** In the bonus sixth stratum, the second floor is made up of these areas, combined with pitfalls and F.O.E.s, forcing the player to fully map out the area and either remember their location at all times or match up what they see with the map.
* InterfaceSpoiler: In ''Legends of the Titan'', the final floors of most of the dungeons have large swathes of untouched territory that can't be accessed. [[spoiler: At the time. Before entering the final dungeon, the guild takes a secret pass through these unexplored areas to gain access.]]
* ItsAllUpstairsFromHere: Played straight in the second game. If you're not in town, you're climbing the [[strike:tower]] tree.
* JackOfAllStats: The Landsknecht and the Princes/ses
* KatanasAreJustBetter: Played straight in the first two games- katanas have a higher damage output than normal swords. However, can only be used by one class, which just happens to be [[GlassCannon the class with the worst armor options.]] Averted in ''The Drowned City'', where katanas (apart from the BraggingRightsReward InfinityPlusOneSword) are on par with other high damage weapons.
* KukrisAreKool: They can be purchased at the shops early on in ''Heroes of Lagaard'' and ''The Drowned City''. In the former they are classified as swords, while they are knives in the latter. Also, the War Magus Artelinde wields one on the end of her staff.
* LastLousyPoint: Possibly the king of this trope is in ''Etrian Mystery Dungeon'': the Green Shard from the Demented King. You have to survive 60 floors without checkpoints, starting at level 1 with no items, just to face the boss each time, and then it turns out that his last of three drops has [[GuideDangIt an obscure condition that no one figured out]].
* LateArrivalSpoiler: While it doesn't spoil ''everything'', Story Mode in ''The Millennium Girl'' definitely takes some of the punch out of the Fifth Stratum WhamEpisode, since [[spoiler:Ricky's backstory reveals Yggdrasil's nature and entire history]] right as you're entering the ''Third'' Stratum. Raquna even makes mention of [[spoiler:being from Ontario]] on the first floor! Not to mention that characters reference and talk about [[spoiler:the [[EarthAllAlong Old World]]]] as early as ''the prologue''.
* LazyBackup: [[JustifiedTrope Justified,]] since [[ArbitraryHeadcountLimit your max party size is five]]; if you even have additional people in your exploration guild, they're stuck back in town, with no way of knowing if the FiveManBand in the dungeon is dead or just doing some [[NintendoHard much-needed]] level grinding.
** However, it is later played straight. If the party actually ''did'' die, the rest of the guild should be smart enough to assume the party died after a week or so of being in the labyrinth, and attempt to collect the deceased members' items and continue on. Since there is no official main character, there isn't a reason for the backup members to take their place.
** ''Finally'' averted in ''Etrian Mystery Dungeon'', where if a party is downed, any guild members at the guild can be sent down to retrieve the downed party to avoid item and money loss.
* LeakedExperience: ''Etrian Mystery Dungeon'' has this, which is justified by the characters training at the Explorer's Guild while not on duty. A skill in the third game also could offer non-combatants a share of the experience. The Yggdrasil Clover Tea in ''Untold 2'' does the same alongside its primary effect of increased experience gain.
* LethalChef: Dalla in ''Legends of the Titan'' can be one if she wishes, as seen in a quest. However it's normally averted, as her skill is praised heavily.
* LethalLavaLand: The [[ExactlyWhatItSaysOnTheTin Molten Caves]] in ''The Drowned City''.
* LifeDrain: The Black Sabbath skill in ''The Millennium Girl''. Though its power depends on the skill level and current party HP, rather than a fixed percentage.
* LightIsNotGood: In ''The Drowned City'', [[spoiler:Yggdrasil is considered the light to the Abyssal God's darkness, and it indeed wishes to protect the world from the God's evil, but its tendency to turn its servants in [[KnightTemplar fanatically single minded]] automatons suggests a ruthless side to it. Though to its credit, it ''does'' mourn Seyfried in the Armoroad ending.]]
* LimitBreak: Present in all four games in different forms. Limits in the third and fourth games don't eat up a character's action phase, meaning you can toss one out and have your character perform a regular action in the same turn.
** In the first game and its remake, activating [[SuperMode Boost]] strengthens any action you take, effectively buffing any skill by 5 levels (i.e. level 5 Immunize becomes a level 10 Immunize while boosted).
** ''Heroes of Lagaard'' replaces Boost with Force abilities, powerful class-specific moves more reminiscent of the classic Limit Break. ''Knight of Fafnir'' modified this system by having two forms of Force abilities. There is Force Boost, in which a skill's effects last for three turns (this includes the protagonist's transformed state), and Force Break, which uses up the entire Force gauge and renders it unusable until the party goes back to Lagaard.
** ''The Drowned City'''s "Limits" are no longer character specific - you equip 'scrolls' to certain characters to use them. Most scrolls need to be on multiple characters, instead of being single-character moves like in the previous games. The upshot of this is that only one of the characters who is assigned to the scroll needs to have a full gauge in order for the Limit to be used, though the skill can still only be activated through a character with a full gauge.
** In the fourth game, they're called "Bursts" and are accessible to every character, but you can only equip 2 of them initially, with the number going up to 5 by doing specific quests for the Guildmaster. Depending on their strength, they can take anywhere from 1 to 5 stocks from the Burst gauge to perform, which you fill up mostly by killing enemies: there is some equipment that allows you to fill it up quicker, and Dancers can learn skills that fill it up faster the more dances are in effect or allow them to randomly consume 1 less Burst stock when using a Burst skill.
** ''Mystery Dungeon'' has "Blasts", which for the most part function like 4's, except that you can use any you have unlocked without needing to equip them, and there are also class-specific ones. In this game, the gauge charges by touching amber tiles as well as killing monsters.
* LuminescentBlush: Raquna from ''The Millennium Girl'' gets this after drinking even a little. There are also a few moments where Frederica gets them.
* MagikarpPower: Certain class abilities are either unavailable without prerequisites, such as the Ronin's Midareba, which, in ''Heroes of Lagaard'' requires ten points in Overhead and five in Dead Law, which itself requires one point in STR Up. Others are near-useless until pumped to near-max level (the Hexer being the infamous example). However, all classes are Magikarp when the game begins, with different rates of growing out of it than others. Ultimately, it depends on the player's build and preferred direction of the classes.
* MarathonLevel: There's a quest in ''Etrian Odyssey'' that has you spend ''five consecutive days'' on a single floor. It's really simple (there's a small area that allows you to heal for free and allows you to walk back and forth without monsters appearing) but it's really, really long.
** Appears in ''Heroes of Lagaard'' as a quest, which requires you to spend three consecutive days on the fourth floor. Unfortunately, there's no safe zone like in ''Etrian Odyssey''.
** Mercifully, while the quest appears again in ''The Millennium Girl'', you can choose to rest at night and also sleep in the following morning to help speed things along. Unless you're playing Classic Mode.
** Ginnungagap [=B3F=] during the Story Mode of ''The Fafnir Knight''. It's a long, labyrinthine trek full of Axolotls that can take away your Force gauge [[spoiler:if you attack or kill them]] and Death Wall [=FOEs=] that will rush you from across the room and are impossible to run from [[spoiler:unless you run when it's guarding]]. Moreover, once you enter you can't leave until you finish, although you get three Return Flutes just in case you get stuck and you can't save inside, preventing it from becoming UnwinnableByDesign. Annoyingly, if you're playing Classic Mode, you receive no warning that this will be a MarathonLevel until you enter the floor, by which point you are unable to leave.
* MetalSlime: Pasarans in ''The Drowned City'', which have a chance to randomly spawn on certain floors. While they're slower than other F.O.E.s, they make up for that with the ability to walk through walls. If you actually catch up to them, they'll constantly attempt to escape (binding their legs prevents this) or [[ActionBomb self-destruct]] (binding their heads prevents that). On the other hand, successfully killing one gets you a lot of ExperiencePoints.
** In the ocean, you have tanniyn. They're quite rare, take several hits to successfully kill (although you can unlock improved harpoons) and will sometimes attack and damage your ship as you fight them. When you kill one, however, their drops are worth a small fortune, especially if you get some Tanniyn Liver.
** Pookas in ''Legend of the Titan''. They also try to escape off the map as soon as they can. If you can chase one down, though, they go down in one hit. but instead of giving experience, they give out [[RareCandy stat-boosting books]].
*** There's also golden enemies, which the game calls "rare breeds": any non-boss enemy can be a rare breed and taking one down multiplies all the experience gotten from that battle by 5, but they also have one of the highest turn priorities and often try to run away. In extremely rare cases, multiple enemies may end up as rare breeds, but you won't get any more experience than you'd get for killing a single one for killing several in a single battle. And yes, F.O.Es can also be rare breeds: while they don't run away like normal enemies, they gain significant stat boosts every turn and if you can't kill one quickly enough, they'll quickly become too strong to take down. In ''Legend of the Titan'' you can also turn any overworld F.O.E into a rare breed if you feed them rare-quality food that they like.
** While absent from The Millennium Girl, The Fafnir Knight brings back these types of enemies via EOU's Yggdrasil plant enemies. These are weak enemies only capable of using a basic attack and give little EXP upon dying. However, they drop tea ingredients that can either increase your Material/Gathering Rates, increase the chance of getting high quality Grimoire Stones, or ''multiply EXP from every encounter by three while also sharing it with the guild members not actively in the party''. While normally rare and hard to find, a DLC released alongside the game makes these enemies spawn at guaranteed rates when accepting their missions.
* MissionPackSequel: The games tend to only incrementally update between installments, but Heroes of Lagaard is by far the most guilty of this as it's more or less the same game as the original. There's a few things that have been balanced, specifically old classes and returning [=FOEs=], and there are some new conveniences like more icons for your maps and the ability to strafe, but the game is basically an expansion pack.
* MoneySpider: [[VendorTrash Averted in the first two games]]. There is one town with one shop, to which monster giblets are sold to raise money and follow the SortingAlgorithmOfWeaponEffectiveness via unlocking more powerful new equipment that just happens to be made from the giblets of more powerful monsters. Compared to other [=RPGs=], this works surprisingly well in both gameplay and story and makes a surprising amount of sense.
** [[NintendoHard It's all part of the challenge]]; [[InventoryManagementPuzzle your inventory is limited to sixty items]], and nothing stacks. Therefore, for every [[WarpWhistle Warp Wire]] or emergency Nectar (for reviving your Medic, you see) you take into the dungeon, that's one less giblet for you to carry back to town and sell...which means [[AdamSmithHatesYourGuts less money to put toward the prohibitively expensive Warp Wires and Nectars]].
** In ''The Drowned City'', however, once you get to the last stratum, a team of farmers with the appropriate skills will make your money issues moot. Mining, chopping, and gathering will net you more or less 100k per visit. Then again, by the time you do reach the last stratum, you won't have much need for money. Good thing [[NewGamePlus it carries over to a new game.]]
** ''Etrian Mystery Dungeon'' is a bit more merciful, giving you a sperate inventory for usable items and supplies. Justified since it's a Roguelike; you're going to need every one of those item slots just to stay alive.
* MookMaker: Some monsters, of course [[FlunkyBoss some bosses]] too.
* MonsterLord: The various Ant Queens. The Abyssal Prince, etc.
* MultipleEndings: ''The Drowned City'' has three. [[spoiler:One where you side with Armaroad, one where you side with the Deep City, and a hidden [[GoldenEnding true ending]].]]
* NamesToRunAwayFromReallyFast: [[spoiler:The Eldest One and the Abyssal God]] from ''The Drowned City.''
* NewGamePlus: Present in ''The Drowned City'', allowing players to pursue the MultipleEndings without having to completely sacrifice their experienced guild. It's also present in ''Legends of the Titan'', but certain things cannot carry over this time.
** In ''The Millennium Girl'', when you start a New Game Plus after the game was completed in Story Mode, you have the option to carry certain things over to ''Classic'' Mode, including levels, En, and even [[spoiler:all your Story Mode characters]]. However, the reverse won't allow you to [[spoiler:actually use your custom-made characters]] in Story Mode.
* NinjaPirateZombieRobot: ''The Drowned City'''s Class and Subclass system allows characters to take on a secondary class, leading to, say, a Princess with Ninja skills, a Farmer-slash-Pirate, a Monk with a Wildling's summoning skills, or even literal Ninja/Pirate, Robot/Ninja, or Robot/Pirate.
* NintendoHard: It is an Atlus series, after all.
* NonStandardGameOver: ''Heroes of Lagaard'' has one if you [[spoiler:choose to leave the Grail of Kings with the Overlord]] in the middle of the final battle.
* OldSaveBonus: By entering a password, players could start ''Heroes of Lagaard'' with their first guild's name. Characters and items were not carried over; instead, [=NPCs=] recognized you as an experienced guild and reacted accordingly. This had its advantages (special in-Labyrinth events that offered extra items and deals) and disadvantages (the first guard not giving you five free Medicas, even though your crew is still made up of rookies...)
** Interestingly, while data similarly cannot be carried '''into''' ''Legends of the Titan'', the game tells you that your data from ''{{LotT}}'' can carry over into ''other''. ''The Millennium Girl'' retains this feature as well.
*** Sure enough, in ''The Knight of Fafnir'', [[spoiler:[[TheCameo old characters can show up to offer you a grimoire stone]]]].
* OneWingedAngel: [[spoiler:Visil]] in ''Etrian Odyssey''.
** Also [[spoiler:Princess Gutrune as the final boss]] in ''The Drowned City''.
** Also [[spoiler:Baldur]] in ''Legends of the Titan''. [[spoiler:[[NotQuiteDead He gets better]], and helps out against a BonusBoss if you request his aid.]]
* OminousLatinChanting: Untold's version of the original game's final boss theme, "[[http://www.youtube.com/watch?v=TrhGP73mHFc Throne of Creation]]".
* OurMermaidsAreDifferent: [[spoiler:The Deep Ones of ''The Drowned City'' are the spawn of an alien EldritchAbomination.]]
* PaletteSwap: Each playable character portrait has an alternate set of colors in ''The Drowned City'' and ''Legends of the Titan''.
* PettingZooPeople: The Sentinels in the fourth game. They're even playable as members of the Bushi class.
* PimpedOutDress: The Princesses sport some really fancy dresses, complete with armor.
* PowerCopying: Grimoires in ''The Millennium Girl'' and ''Knight of Fafnir'' allow a character to use an enemy's skill.
* {{Precursors}}: The Ancient Civilization in ''The Millennium Girl''.
* PrettyInMink
* PreviousPlayerCharacterCameo: Some of the QR Quests from ''Legend of the Titan'' have connections to previous games. For instance, the "Finest Plains" quests are from Farmers, with Kirtida complimenting one's distinctive hood.
* PurposelyOverpowered: The Seven King Grimoire in ''Untold'' combines the best skills from the seven baddest bosses in the game. Getting ONE King Grimoire is a GuideDangIt; ALL SEVEN are needed to make this one.
* QuirkyBard: Strongly averted in ''Etrian Odyssey'', where Troubadours are the second-biggest [[GameBreaker Game Breakers]] behind only Immunize Medics . They were [[{{Nerf}} nerfed]] hard when ''Heroes of Lagaard'' removed Healing and Relaxing, but they still pull their weight with Bravery and (arguably) Stamina.
* RandomDrop:
** Subverted with conditional drops, which require enemies to be killed in a certain way.
** RareRandomDrop: You can bring anyone who tried to get it in ''Etrian Odyssey'' to tears with the phrase "Shinryuu Sword." The materials used to make this particular sword are rarely dropped by the [[BonusBoss three elemental dragons]].
* RareCandy:
** Stat Books in ''The Drowned City''. They can be found in treasure chests, given as quest rewards... and [[RandomDrop dropped from powerful F.O.E.s after they are slain]]. Thankfully, there are items and skills that can be used to ensure that they are dropped. They return in ''Legends of the Titan'', as rewards from catching and defeating [[MetalSlime Pookas]], but each character can only use 10 of each type of stat book.
** White Potions in ''Etrian Mystery Dungeon'' instantly raise a character's level by 1. Golden Potions increase it by ''3''.
* ReasonableAuthorityFigure: All authority figures in ''Legends of the Titan''. [[spoiler:Even Wufan, who took some Vessels with her to rescue the Medium instead of waiting for the council to make a decision, as well as Baldur, who was originally following the same ideal as his father. Baldur averts this later, however, due to becoming more desperate as the barren land rapidly approaches his empire... though he does get some points back in post-game when he fights to protect his people during their relocation.]]
* RecurringRiff: ''Scatter About'', the theme of the [[BonusBoss Elemental Dragons]], appears in every installment of the series. ''The End of The Raging Waves'' from the third game is remixed to ''The End of The Raging Winds'' in the fourth game.
* RecycledSoundtrack: Most of ''Etrian Mystery Dungeon'''s soundtrack is remixes of themes from the other games.
* RemixedLevel: Most of the maps in the ''Untold'' games are very different from their original versions, forcing the player to make their maps from exploration instead of memory.
* RespawningEnemies: Slain F.O.E.s in ''Etrian Odyssey'' come back after three in-game days. Plot related bosses come back after eleven. From ''Heroes of Lagaard'' onward, this increased to 7 days for normal F.O.E.s and 14 days for bosses.
* {{Retraux}}: The whole series came about because a certain game designer really wanted there to be ''VideoGame/DungeonMaster'' for the DS. Every aspect is lovingly oldschool, even down to the music, which was actually entirely composed on a PC88. [[http://www.youtube.com/watch?v=zhXG1mho9-s Example from the third game.]]
* RoyalRapier: Princes (and [[EverythingsBetterWithPrincesses Princesses]]) and [[{{Pirate}} Buccaneers]] use them. Usable by Landsknechts and Arcanists in ''Legends of the Titan'' as well.
* RunOrDie: Unless you're significantly overleveled for the floor you're on, this is what you do when[[note]](yes, ''when'', not ''if'')[[/note]] you get into a battle with a F.O.E. Pray that your back is clear or that you can escape from battle to another floor, or you're trapped.
** The fourth game's dragons are essentially F.O.E.s cranked UpToEleven. They take up a massive 9 squares on the map, move 2 squares at a time and get a cutscene when they show up on the field. If one of them catches up with you, you don't even get a HopelessBossFight - just a message that the dragon smashed your skyship and you, and your party is sent back to town with at a random number of the party dead or at 1 HP. You also lose food collected on the world map, excepting any collected for quest purposes. Still better than an instant Game Over.
* SadBattleMusic: "Guardians of the Sorrowful Ice", the battle theme of [[spoiler:Wilhelm and Artelinde]] in ''Heroes of Lagaard''.
* SadisticChoice: In ''The Drowned City'', [[spoiler:you must choose whether to preserve the Deep City, or to expose it's existence to the rest of the world. Either choice determines which hidden class you unlock, as well as how the rest of the story plays out. You can TakeAThirdOption, but doing so is a GuideDangIt as you have to turn in one mission but not accept the one that becomes available as you do so in order to get another mission from a specific source with no indication at all.]]
** Also in ''The Drowned City'', [[spoiler:you indirectly decide which member of the Murotsumi Guild dies. No way to save both.]] This almost wouldn't qualify if it weren't for the fact that it repeats every playthrough, meaning after the first time through you know what is going to happen the moment the choice pops up.
*** [[spoiler:Hypothetically you can save them both. If you refuse to cooperate with them, you are never told whether or not the Murotsumi Guild is given permission to explore deeper into the dungeon. Therefore it becomes a Schrodinger's Cat situation. Does Murotsumi Guild get permission and you simply aren't told, thus leading to their demise or do they not receive permission and you aren't told, thus having them avoid being killed? Keep in mind that no matter what you chose, you never hear or see them again.]]
* SecretAIMoves: Enemies have a completely different set of skills than you, though the effects broadly parallel your skills. ''The Millennium Girl'' plays with it, since many enemies skills can drop on Grimoire Stones. However, the composition of the stone is randomized [[GuideDangIt unless you know exactly how to manipulate the system]]. Even so, it can take quite a while to get the Grimoires you want or need.
* {{Sarashi}}: The Ronin class.
* ServantRace: In ''4'', [[spoiler:the Vessels and Sentinels, as well as the Hollows, were created by humans to aid in the completion of the Yggdrasil Project.]]
* ShaggyDogStory: Some choices can come across as this. One dungeon has a hidden crayfish in a pond, which continuously snaps at whoever tries to catch it, and pretty much taunts you every time it does and every time you nearly catch it only for it to escape anyway. Whenever by sheer luck you actually manage to grab it, you exult in your victory for five full seconds before questioning why you wanted it in the first place and kicking it back in.
* ShmuckBait: Go ahead. Rest in the clearing. We dare you.
** In the second game, a squirrel steals your life-saving warp wire every time you try to pet it. Particularly dangerous for genre-savvy players who expect it might give some reward eventually, but every encounter plays out exactly the same.
* ShoutOut: There's many [[TheCameo cameos]] and miscellaneous references to another [[NintendoHard fantastically difficult]] Atlus series, ''TraumaCenter'', including Dr. Hoffman, Healing Touch and Caduceus in ''Etrian Odyssey'', Dr. Stiles and Healing Touch in ''Heroes of Lagaard'', Angie in ''The Drowned City'', and Dr. Cunningham as a playable Medic in ''Legends of the Titan''. In addition, while Dr. Hoffman is absent in ''The Millennium Girl'', the English dub has [[HeyItsThatVoice a couple of familiar voices]] from ''Trauma Team''.
** [[http://www.youtube.com/watch?v=Kj9COPsEsoc#t=0m31s Take a look at the names used in this video]]. [[Webcomic/{{Homestuck}} Terezi, Kanaya, Gamzee, Equius, and Karkat]]. And three of them were only revealled a few weeks before the vid was released, at most. Someone at Atlus USA must really like Webcomic/MSPaintAdventures.
*** They also hired a member of the ''Homestuck'' art team, Alexandra "Lexxy" Douglass, to illustrate for the art book included with North American preorders of ''Legends of the Titan''. There's also a QR quest that has a shield named after her nickname as a reward.
** The entirety of the [[spoiler:Cyclopean Haunt]] in ''The Drowned City'' is full of references to Creator/HPLovecraft. Some are obvious (e.g. the [[spoiler:Deep Ones]]); others are less so (powder of Ibn Ghazi, anyone?).
** Also in ''The Drowned City'', hit Y to bring up the "alternate colors" for the Buccaneers. One of them [[VideoGame/TheCurseOfMonkeyIsland looks rather like he has the surname Threepwood]], and another [[VideoGame/TalesOfVesperia looks suspiciously like a certain Ms. Fleur]].[[note]]Sadly a lot of fans will miss out on the second one since the PS3 version won't be coming to America.[[/note]]
*** One of the monks has a strong resemblance to a [[Manga/RanmaOneHalf certain pig-tailed Martial Artist...]]
** Speaking of the monk, one of its attacks is named [[VideoGame/StreetFighterII Kikouken]].
** One of the ninja's ability is called [[IzunaLegendOfTheUnemployedNinja Izuna]].
** The names of many weapons as well, katanas in particular.
** There's a very, very subtle one to [[http://imageshack.us/photo/my-images/593/247201ladyboners.jpg/ a meme]] from [[ImageBoard /r9k/]].
** In ''Untold'', Austin is a clear SherlockHomage. Reinforcing this, a barfly related to him [[spoiler:(heavily implied to be his Moriarty figure, Baroudeur)]] is described as "[[http://en.wikipedia.org/wiki/The_Man_with_the_Twisted_Lip man with twisted lip]]".
** On a slightly more subtle note, one of the Gunner class portraits wears a pin on her hat bearing the face of the Jack Frost monster from the ''Franchise/ShinMegamiTensei'' series, and Olympia from ''3'', [[spoiler:prior to her RoboticReveal]], wears Pyro Jack's face, from the same game.
* SlippySlideyIceWorld: ''Heroes of Lagaard'''s third stratum. The third Maze in ''Legends of the Titan'', after destroying a cluster of heat scales, will temporarily have that floor become cold and the water frozen.
* SocializationBonus: [=StreetPassing=] with the 3DS games swaps guild cards with other players, and gives you some benefits, like being able to use one of their guildmembers or acquiring items from them.
* SortingAlgorithmOfWeaponEffectiveness: Played straight most of the time, as the weapons created with the materials sold to the shop just happen to get stronger as the game progresses. There are exceptions, though, such as how killing bosses in specific ways can get you items that create some of the strongest items in the game early on. You still have to gather the money to buy those very expensive weapons, though.
* SpellMyNameWithAnS:
** Before the official names in ''The Millennium Girl'' were released, Raquna's English name was spelled either the official English name, Racoona (the Japanese website's spelling), Lacoona, or Laquna by fans.
* SpoilerOpening: ''The Millennium Girl'''s opening reveals who the villain is.
** In a more minor example, ''Fafnir Knight'''s reveals [[spoiler:Artelinde and Wilhelm battling the guild]].
* StarPower: Zodiacs from ''The Drowned City'' study the stars to learn magic.
* StoneWall: The Protector, Hoplite and Fortress. They have skills which increase their own defense and draw attacks to them. They also double as BarrierWarrior.
* StupidityIsTheOnlyOption: In the fourth Maze in ''Legends of the Titan'', one kind of F.O.E. doesn't move at all unless you trigger an alert from a different F.O.E. The former completely lacks weaknesses and resists most attacks. If an alert is activated, it's capable of moving much faster than the party can. Naturally, there's an occasion where it's acting as a roadblock, and you have to activate it in order to advance in the dungeon. Fortunately, it's possible to open up secret passages to maneuver around the F.O.E. in question for subsequent trips into the dungeon.
* SummonMagic: [[TheBeastmaster Wildlings]] summon animals into battle, whose specialty is inflicting status effects.
* SuspendSave: Used in all games from ''Heroes of Lagaard'' on.
* TakeThat: One is made in the ''Legends of the Titan'' comic towards players who don't like the new Casual mode.
* TechTree: Each class has a rather elaborate one.
* TempleOfDoom: The Fourth Stratum in ''Drowned City''.
* ThemeMusicPowerUp: In ''Fafnir no Kishi'', this happens in battle as long as the hero is transformed.
* ThereAreNoTents: Aside from the deathtrap/field of flowers in the first strata, all other games besides ''The Drowned City'' play this straight.
* ThereIsNoKillLikeOverkill: The superboss of 2 has an attack called Begone that it uses after [[ThirteenIsUnlucky 13 turns]] that [[TotalPartyKill deals around]] ''[[TotalPartyKill ten thousand damage]]'' [[TotalPartyKill to the whole party]]. For reference, the HP cap is 999. It can, however, be survived with timely use of the Protector's LimitBreak, which negates all damage for a turn.
** This is the entire point of the main character in ''Knight of Fafnir''. It's entirely possible for him to kill the ''bonus boss'' in one turn.
* TimeLimitBoss: In area V of Gladsheim in ''The Millennium Girl'' [[spoiler: an unwavering M.I.K.E.]] must be fought along the path to stop [[spoiler: Gungnir from destroying Etria]], making him this.
* TimeStandsStill:
** The Ronin's LimitBreak in ''Heroes of Lagaard''.
** In ''The Drowned City'', Sea Quest battles don't cause the in-game clock to advance -- or rather, it may move forward during the battle itself, only to revert to its original setting once the fight's finished.
* TimedMission: In the last Area of the Gladsheim in ''The Millennium Girl'', you have to cross the map to [[spoiler:deactivate Gungnir to stop it from destroying Etria]] within 50 turns. This includes defeating the boss, [[spoiler:the [[ArtificialIntelligence AI]] called M.I.K.E.]]
* TooAwesomeToUse:
** Coupons in ''The Drowned City'' allow you to purchase any item at half price, from basic supplies to an InfinityPlusOneSword. You can also only get eight of them. Ever. Even a NewGamePlus doesn't allow you to get more.
** Formaldehyde, from the same game, guarantees a 100% drop rate on ''all'' the items a given enemy drops if it's killed on the turn the item is used. They're also in short supply and a NewGamePlus doesn't restock these chests. You can make them once you reach the [[BonusDungeon sixth stratum]], by selling item drops from F.O.E.s there. Just remember that each item you sell makes one unit of Formaldehyde. [[SarcasmMode Have]] [[ThisIsGonnaSuck fun!]]
*** It returns in ''Legends of the Titan'' and ''The Millennium Girl'', but are much more rare. On the bright side, the chests containing them are restored on a NewGamePlus. You still need late-game drops to buy more, however.
* TransformationIsAFreeAction: The hero in ''The Knight of Fafnir'' appears to be able to transform using Force Boost instantaneously during battle and during cutscenes.
* TraumaInn: The inns fully heal HP and TP regardless of how long the characters stay, although the inns can't revive or cure petrification, which are handled by the hospitals outside the inns. ''The Drowned City'' has the revival clinic as part of the inn, though.
* TraversibleWorldMap: ''Legends of the Titan'' has one, unlike every other game in the series. The series' traditional "Stratums" are now broken into smaller dungeons and larger labyrinths.
* TrueFinalBoss: All games have one. They tend to be quite [[EldritchAbomination Lovecraftian.]]
** ''Millennium Girl'' plays with this by making its FinalBoss a weakened version of the original game's TrueFinalBoss. Then you unlock the BonusDungeon where you can fight it without a handicap.
* UndergroundMonkey: They're mostly regular enemies, but some F.O.E.s appear as modified enemies as well.
* UnderTheSea: The Undersea Grotto from ''The Drowned City''.
* UnlockableContent: The second game would let you carry over some information from the original Etrian Odyssey for benefits.
** Etrian Odyssey IV and Etrian Odyssey Untold both have QR unlockables. In the case of the former, some [[https://www.mediafire.com/?w5awyrz5swigej1 official codes]] can be used to give new missions, items, or armor to characters. Both games also allow other players to send guild cards to others, allowing them to have access to the other players' [[http://etrian.wikia.com/wiki/Guild_Cards#Etrian_Odyssey_IV party members]] or [[http://etrian.wikia.com/wiki/Guild_Cards#Etrian_Odyssey_Untold:_The_Millennium_Girl Grimoire stones]] respectively.
* UselessUsefulSpell: Completely averted. Status affects and bindings are not only useful, but can literally mean the difference between life and death. [[spoiler:The Hollows and the Hollow Queen]] from ''Legends of the Titan'' is practically ''impossible'' unless you have spells or weapons that cause head and leg bindings, which the stratum thankfully gives you on that floor.
** It also helps that almost all attacks that inflict status effects, or bindings do at least as much damage as your normal attacks, are dirt cheap to use or affect multiple enemies and try to inflict the status effect multiple times over several turns after a single use. Once they land, you can get free attacks off them or gain massive damage boosts against any enemy with a status aliment.
* VendorTrash: The items dropped by enemies have no uses aside from being sold to the shops. Once sold, they are used by the shop owners to craft new items for you to buy. A very few dropped items in ''Heroes of Lagaard'' can be used to heal instead, though.
* VoiceGrunting: Present in ''The Millennium Girl''.
* WakeUpCallBoss: Yes, despite the games being [[NintendoHard Wizardry Hard]], there are bosses can crank the difficulty up even higher. Special mention goes to Fenrir; the party has yet to escape PerpetualPoverty, or have the levels/skills to fight effectively. Adding to the problem, first stratum enemies and FOEs don't yield enough experience to make grinding easy.
** So you got past the Great Lynxes and Largebills on the first two floors of ''The Drowned City'' and you're breezing through the rest of the first stratum? Don't worry - [[FlyingSeafoodSpecial Narmer]] is waiting at the end of the fourth floor to remind you that this is still an Atlus game.
** In ''Legends of the Titan'' the Berserker King (the first boss) is a crash course in isolating the boss from nearby F.O.E.s. The second boss is another, in demonstrating that binds are ''not'' {{Useless Useful Spell}}s.
* WeaponOfChoice: Each character class has one or two weapon types they can use, and some weapons can be used only by certain classes. In ''The Drowned City'', two weapon types, [[KnifeNut knives]] and [[ThrowTheBookAtThem books]], can be used by anyone, although ninjas can benefit more from knives.
* WellIntentionedExtremist: [[spoiler:Visil]] in ''Etrian Odyssey'' [[spoiler:sets up the whole labyrinth exploring thing only to make the city more wealthy in order to keep the purifying thing going. He wants the explorers to explore the labyrinth, but would kill them if they go too deep.]] From the remake, we have [[spoiler:M.I.K.E., who ultimately wants to commit mass murder in order to stop the Core.]] [[spoiler:Overlord]] in ''Heroes of Lagaard'', [[spoiler:both king Seyfried and princess Gutrune]] in ''The Drowned City'', and [[spoiler:Emperor Baldur]] in ''Legends of the Titan''.
* WhamLine: The name of the Fifth Stratum in ''Etrian Odyssey''. Nothing prior in the game could have possibly prepared you for [[spoiler:Lost Shinjuku]].
** And more an encapsulated Wham Moment from ''Legends of the Titan'': you are following a certain someone after events at the end of the third land. You enter the fourth. Yggdrasil looms overhead, [[http://www.youtube.com/watch?v=MHOgJfZcc3U this music starts playing]]... and the camera pans down to show that you're being confronted by [[spoiler:three heavily-armed sky-battleships, which were previously thought to be an impossibility]], and the lead ship greets you with a heavily-armored figure saying, paraphrased: [[spoiler:"Bring your city's leader here. The Empire will explain its actions."]] This is when you know things have gotten ''real''.
* WhenTreesAttack: The recurring Rockwood/Medusa Tree and Sickwood/Gasser Tree enemies. Arguably the Petaloid family as well, although that's closer to When Flowers Attack. [[spoiler:Visil's OneWingedAngel form in ''Etrian Odyssey'', the Etreant, is a fusion of himself and the Yggdrasil Tree, while the eponymous Titan of the fourth game ''is'' Yggdrasil itself in a humanoid form.]]
* WhereTheHellIsSpringfield: This has actually cropped up, courtesy of ''Millenium Girl'' and ''Fafnir Knight'' [[spoiler:making it explicit that all the games share a continuity and that there are seven Yggdrasi dotting the surface of the [[EarthAllAlong post-apocalyptic world]]]]. To wit:
** ''[=EO1=]'' was originally an aversion; [[spoiler:Lost Shinjuku left little doubt as to ''exactly'' where you were]]. ''Millenium Girl'', though, adds a decent bit of confusion to the mix, as [[spoiler:between being not too far for a blatantly-Gaelic "Highlander" to make the journey there, being close enough to "Ontario" (e.g. almost certainly the actual place) to have large parcels, including a cream churn, delivered there, Ricky Irving (who is, even in the Japanese version, almost certainly an American) being put into cryosleep in the area before the Big Disaster, and the AI near Etria having an Anglic nickname to boot, it would make more sense overall for the area now called Etria to be located on the Eastern Seaboard of America, probably near New York, Boston or Philadelphia. Lost Shinjuku is ''still there'', though.]]
** Starting in ''[=EO2=]'', things got a little less obvious. However, [[spoiler:given the way the new, treated-as-locals classes are dressed (or are literally shaggy bears), the colder climate in general, and being located up in the mountains as a refuge for older, larger cities as per Lagaard's legend, it's often been suspected that Lagaard is located in northern or eastern Europe, in the Ural Mountains, the Alps or maybe even the Scandinavian Mountains. ''Fafnir Knight'' reinforces this a decent bit, with Bertrand's blatantly French last name and Arianna being from the relatively nearby kingdom of "Caledonia" - that being an old name for ''Scotland'', which all leans on the Alps theory.]]
** ''[=EO3=]'' is also not super obvious... by itself. [[spoiler:The island itself and the dress of a lot of the inhabitants suggests it's in the Mediterranean, which would also make some sense given the nearby archipelago. ''Fafnir Knight'' also drops the hint that it's located in the general "south", which also could suggest the Mediterranean, though some have taken it as a suggestion it's located further south and possibly in the overall global south, perhaps in the South China Sea, the Phillipines or Indonesia. The island-hopping sailing aspect would certainly make a lot of sense for any of those options, to boot.]]
** ''[=EO4=]'' is perhaps the most "non-obvious" of the main games. [[spoiler:At first. Despite the "European genericness" of Tharsis and the Nordic bent of the Empire's royal family, between the obviously Chinese-inspired second land (particularly the names), the blantantly Japanese names of the third, and the heavily terraced hills in and visible beyond the fourth land, it seems very likely that the Tharsis Yggdrasil is located somewhere on continential Asia, probably either in China itself or on the Indochinese Peninsula.]]
** The Midgard Library, featured in the ''Untold'' games, likewise has no definite position. [[spoiler:It definitely seems to be in the rough global north since Armoroad is definitely far to the "south" of it, but Lagaard is similarly a fair way "north", or at least distant from Midgard. Ontario doesn't seem to be too far, however (given that Raquna works for the Library), nor does the apparently-Ameri-European-esque town of "Gotham" - a popular alternate name for New York - which was the original home of Simon and Arthur. This suggests that Midgard, at least, is probably somewhere on the North American continent even if Etria isn't.]]
** [[RunningGag Ontario, however, is always definitely Ontario.]]
* WholeCostumeReference: The first prince outfit in ''The Drowned City'' is extremely close to the king's outfit in ''MyLifeAsAKing''.
** The alternate colour of the rightmost Arcanist in ''Legends of the Titan'' is [[{{Vocaloid}} Miku]].
* WombLevel: The sixth stratum in ''Etrian Odyssey''. The walls seem made of flesh, blood cell enemies, damage tiles that look like stomach acid, and the final boss is called the "heart of the labyrinth". In spite of all that, it's still a ''forest''.
** The sixth stratum of ''The Drowned City'' qualifies as well. [[spoiler:Only it (fittingly) looks like you're inside a tree's body with the anatomy of a human]]. Some liberties are taken for the sake of challenge, however.
* XanatosGambit: [[spoiler:Visil]] pulls one in ''The Millennium Girl''. [[spoiler:If he beats the party, the labyrinth's secrets are protected. If the party beats him, he finally found someone strong enough to kill the Core.]]
* YouGottaHaveBlueHair: With ''The Drowned City'' adding {{Palette Swap}}s for every character portrait, this has become more common. In ''Legends of the Titan'', purple and teal hair is particularly common among the alt-colors.
* YouNoTakeCandle: The bartender in ''The Drowned City'' speaks with a little of this.
* ZigZagPaperTassel: In the fifth stratum of ''The Drowned City''.
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