[[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 Yggdrasil")[[/note]] is a first-person tile-based dungeon-crawler series published by {{Atlus}} and co-developed with Lancarse, consisting of four major installments and a [[VideoGameRemake remake]] of the first game.

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 ''Etrian Odyssey IV'''s 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, will be released in 2014.

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)
* '''''Shin Sekaiju no Meikyuu 2: Fafuniiru no Kishi''''', currently in development in Japan [[note]]Speculated to be ''"Etrian Odyssey II Untold: The Knight of Fafnir"'' for the localized name[[/note]] ({{Nintendo 3DS}}, Japanese release scheduled for 2014)
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!!This series provides examples of:
* AbandonedLaboratory: The [[spoiler:Hall of Darkness]] in ''Legends of the Titan''.
** The new dungeon, Gladsheim, in ''The Millennium Girl''.
* 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}}''.
* ActionBomb:
** A few enemies in ''The Drowned City'', mainly the [[MetalSlime Pasaran]].
** The Flame Rat in ''Legends of the Titan'' can be one if it's with the 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 often favors using women. This extends to the point that each game uses a woman as its representative/'mascot':
** ''Etrian Odyssey'' uses the blonde Protector.
** ''Heroes of Lagaard'' uses the 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.
** And ''Untold'' has Frederica, naturally.
* AdamSmithHatesYourGuts: One of the many, things that makes these games hard is that almost every item and service, even the lowliest healing item, is ludicrously expensive.
** ''The Drowned City'' cuts the price of revival items 90% to a mere 50en! But there is a catch. While in the past games the shop only require additional materials if you wish to get a unique weapon again, this time ALL items (provided you have unlocked them) can run out of stock if you don't give the shop enough materials. So if you just ran out of the medicine you want, you have to farm the materials again.
* 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'' was set up as After The End in the pre-title intro, which established that the Labyrinth was formed in an apocalyptic disaster that ended the previous age; however, the exact nature of the world '''Before''' The End is a major plot twist in the game.
** ''Heroes of Lagaard'', mentions Etria several times, confirming that it takes place on the same world. The game's plot also revolves around the aftermath of the apocalypse.
** In ''The Drowned City'', it is quickly established early on that there has been a 'Calamity' of some sort a hundred years ago that destroyed Armoroad's former prosperity.
** It's revealed in ''The Millennium Girl'' that the Calamity is [[spoiler:the Yggdrasil Project's core corrupting and becoming a horrific monster with godlike regenerative abilities. While it's possible to stop it, fighting it without the proper weapons will lead to how Armoroad became or ''worse''. There are also ''seven of these''.]]
* 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: It's actually become ''unclear'' if this applies - the first two games are explicitly linked (as in, you can use a password to make your ''[=EO1=]'' guild the ''[=EO2=]'' guild-plus-locals, which is generally seen as canon), but then ''3'' and ''4'' seemed to exist in each of their own little pockets, with some shared enemies at best (although in ''4'', [[spoiler:the Imperials resembling a ''significant'' number of previous hero portraits raised some eyebrows]].) ''Untold's'' Story Mode, however, does quite a bit to suggest that ''4'' is very much contiguous with the first two games, and makes it plausible that ''3'' would be as well. WordOfGod is currently silent on the question, however, so for now whether there's one continuity or three - or whether players are meant to interpret it however they wish - is up in the air.
* 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]].
* AngstWhatAngst: Invoked in ''The Millennium Girl''. After [[spoiler:defeating Ren and Tlachtga]], Simon says that it's no time to angst, as they need to [[spoiler:find Visil.]]
* 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 on particularly hilarious display in ''Untold'' - the new story-mode cast is, of course, the most recent creation of Mr. Himukai... and they share a game with the ''unaltered'' art from the original game. It's all been up-rezzed compared to the DS version to better fit the 3DS top screen, but the art is otherwise unaltered. During the story mode this doesn't stand out ''too'' bad, if only because the game makes sure that the new cast only ever shares screen-time with Ren, Tlachtga, Quinn and Disil, but if you import the story team into Classic mode in a NewGamePlus, the art difference when put right next to the old designs in a party can be jarring. (The hair and eyes, in particular, often look wildly different.)
* 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 enemies in ''The Millennium Girl'' with Cover will sometimes guard an enemy when the enemy using Cover is at low health. 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.
* 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 four 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''.
* 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 seven/six 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 Batou in ''The Drowned City''. While it's capable of defeating the bonus boss in a single hit, it requires multiple turns to set up effectively and requires you to leave empty 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''.
* BagOfSharing
* BarrierWarrior: Protectors in the first two games, 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.
* 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.]]
* BlackoutBasement: 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 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.
* BlindIdiotTranslation: Some skills in ''The Millennium Girl'' have mistranslated description. 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. 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.
* 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]].
* BonusDungeon: See above.
* 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 And worst of all, 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 pretends to be this so the party will attack him, which will allow him to see if the party is strong enough to fight the Core.]]
* 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? ''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 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''.
* 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.
* 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 once.
* 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''.
* DrivenToSuicide: A possible curse the Hexer can do to a terrified enemy has it attack itself.
* DualBoss: [[spoiler:Ren and Tlatchtga]] in ''Etrian Odyssey'' and ''The Millennium Girl'', [[spoiler:Artelind 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.
* DungeonCrawling
* TheDragon: [[spoiler:Ren and Tlatchtga]] in ''Etrian Odyssey'', Colossus in ''Heroes of Lagaard'', and [[spoiler:Kujura and Olympia]] in ''The Drowned City'', to [[spoiler:Princess Gutrune and Abyssal King Seyfried, respectively]].
** [[spoiler:Whirlwind, aka Logre]] is one to [[spoiler:Baldur]] in ''Legends of the Titan'', at least before [[spoiler:he joins Tharsis' side]].
* [[spoiler:EarthAllAlong]]: Major plot twist revealed in the fifth stratum of ''Etrian Odyssey''.
** Further enforced in ''The Drowned City'''s sea areas. [[spoiler:Many of the foreign ports are based on their real life counterpart, though for some of them, they use the old name for the cities so you may not realize it first.]]
* EarlyGameHell: For such a hard game, its even harder at low levels.
* EarlyBirdBoss: An optional one occurs in ''Etrian Odyssey'' where a pack of Venom Flies may be fought ''during the first quest''. Sure, they're normal enemies on the next floor, but they are deadly to level appropriate adventurers too, and they're in the deepest part of the area (meaning you are already exhausted and you will have a hard time retreating afterwards). It can be avoided if you know which dialog option to pick, but otherwise...
** Fenrir comes right after the initial hump of PerpetualPoverty, but before your party has hit the point they may reasonably have the powerful skills to make the rest of the game winnable and the enemies (Even the F.O.E.s) at that point are too pathetic to reach the recommended level with any decent speed. Thankfully he can be skipped temporarily with effort by use of a GoodBadBug.
* EldritchAbomination: The TrueFinalBoss / BonusBoss in every game. ESPECIALLY in ''Etrian Odyssey'', its remake, and ''The Drowned City''. [[http://img.youtube.com/vi/J8dmjWFFnCk/0.jpg This... thing]] would make H.P. Lovecraft proud.
* EleventhHourSuperpower: In ''The Millennium Girl'''s Story Mode, in the second round of the FinalBoss, [[spoiler:Kupala, the forest folk from the fourth stratum, 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 have these. For instance, the Boost Up skill from the first game only increases Boost's effect with an odd amount of SP invested (which makes this especially bad is that it's a 10 point level - the last point does nothing). Even more [[{{Egregious}} egregiously]], Arm Heal, also a 10 point skill, only has three levels where it gets improved (and out of those, the first one is the only one which does more than 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. When it flashes blue, you're safe, if yellow, be careful, and if red, get ready to fight. The radar also tells you when an F.O.E. is nearby; When an F.O.E. is within 3 squares from you, an extra bar in the radar will tell you how near you are to the F.O.E. Which is handy in ''Heroes of Lagaard'' where you have F.O.E.s which don't show up in your map, and very helpful 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.
* EverythingsBetterWithPrincesses: ''The Drowned City'' not only features the Prince(ss) class for your use, but Princess Gutrune of Armoroad and Princesses from other lands as well.
* ExcuseMeWhileIMultitask: Maps can be drawn while still in battle.
* ExcusePlot: Sort of. The introductory plot to ''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." It tends to remain so for about 3/4 of the entire game, but then things suddenly start happening near the end. 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 Millennium Girl'''s Story Mode, where the same plotline in the original is expanded upon and spread out over the course of the entire game.
* 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 moths.
* {{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.]]
* ExtendedGameplay: Each game has a stratum, several quests, and several bosses that can only be attempted 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''. This has no effect on his accuracy, however, and [[spoiler:he gets better after he's defeated]].
* FanService: Some of the character designs are very... [[{{Stripperific}} questionable]]. Male fanservice isn't uninvited either. Check out the first male design for pirates in the third one. Now double back and realize he [[WalkingShirtlessScene isn't wearing a shirt under his vest.]]
** The Dark Hunter's whip skill tree has a very clear bondage theme. Aside from the basic binding skills (gag, cuffs, shackles), the Dark Hunter's final two 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.intothelabyrinth.net/gallery/displayimage.php?album=9&pos=6 Etrian Odyssey comic]] showcasing the Dark Hunter.
*** The enemies are not spared either. Some humanoid enemies wear nothing but GodivaHair and CensorSteam. Mixes with FetishRetardant as many of these monsters have massive tentacle monster bodies below the torso.
* FantasticNuke: [[spoiler:Gungnir]] in ''The Millennium Girl''.
* FeaturelessProtagonist: Your characters are complete 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. You get to choose from one of four portraits per class, and from those you can probably guess the gender (1 and 3 are male, 2 and 4 are female.) That's all you get, and none of that even remotely affects the gameplay. [[HelloInsertNameHere There isn't even a default suggestion for their names.]] The tutorial gives the option of making the guildmaster one of the adventurers, but that isn't followed up upon.
** ''Legends of the Titan'' shakes this up a bit. You do eventually unlock other classes just like in other games, but [[spoiler:while you still fight two of the three class representatives, if you play your cards right, they can ''join'' the party as regular player units.]] You're still welcome to recruit anonymous new schlubs, of course.
** Averted in ''The Millennium Girl'''s Story Mode.
* FetchQuest: Many missions include going and finding some item in the Labyrinth, these can be random drops or in set locations.
* FightWoosh: One for every stratum.
* FiveManBand: The classes for the first two games can operate as an example.
** 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 Millenium Girl'' has:
*** TheHero: The [[HelloInsertNameHere Highlander protagonist]].
*** TheLancer: Raquna.
*** TheBigGuy: Arthur.
*** TheSmartGuy: Simon.
*** TheChick: Frederica.
* FlavorText : Description are provided for each enemy.
* FlyingSeafoodSpecial: Lots of monsters are these. Cotrangl/Corotorangul in ''Etrian Odyssey'' and ''The Millennium Girl''. It returns with Narmer, Ketos, Cruel Roamer, and Hammerhead in ''The Drowned City''.
* FlunkyBoss: The first stratum boss of the first three games involve multiple weaker F.O.E.s in the fight somehow. In ''Etrian Odyssey'' a [[WolfpackBoss wolf pack]] spawned behind Fenrir and thus the boss would receive constant reinforcements unless you killed him quickly.
** 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, and repeats this process until she either kills you or you win.
* 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.
** ''The Millennium Girl'''s Drake, 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 Millennium Girl'', Arthur will complain about getting his formulas wet in the third stratum, even if you change his class to something else.
* GenreBusting: Part EasternRPG-style battles, part WesternRPG-style character customization, part DungeonCrawler.
* 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''.
* GrailInTheGarbage: A quest in ''Legends of the Titan'' centers on a piece of armor. The questgiver is so disgusted with it that he gives it to you, only for Wynne to fix it up for free and make it a great piece of plate mail.
* GratuitousGerman: Landsknecht. Wilhelm's nickname "Der Freischütz". There may be other examples.
* GreenHillZone: The first stratum in the first three games, and the first few dungeons that you visit 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 with in order to help them out on their sea quest.
** Either Kirjonen or Wiglaf in ''Legends of the Titan'' can be one if you help one of them in battle while exploring the Lands. They can also join you, if you want, when you're battling [[spoiler:the Blizzard King and the Storm Emperor]], respectively. In the post-game, [[spoiler:Baldur]] will be this when you battle [[spoiler:the Great Dragon]].
** Also in ''Legends of the Titan'', the three unlockable class representatives can temporarily join your party on the floor the dungeon boss is on. If you leave the floor before you kill that boss, they'll leave your party until you return to that floor, at which point they'll ask if you want them to join your party again.
** 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]].
* 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, better hope you know that aligning the final digit in your guild card stats increases your chances!
* GunsAreWorthless: Subverted too, gunners are capable of very high 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.
* 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 without any defense on the front line.]] 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 Artelind wields one on the end of her staff.
* 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.
* 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.
* LeakedExperience: A skill in the third game.
* 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. In the first game, activating [[SuperMode Boost]] makes whatever action you take become stronger, as well as bumping up the effects of any skill used by 5 levels (a level 5 Immunize becomes a level 10 Immunize while boosted); a defensive skill becomes more defensive, an offensive skill becomes more offensive, a healing skill heals more, and so on. ''Heroes of Lagaard'' replaced Boost with the [[LimitBreak Force]] abilities, powerful class-specific moves more reminiscent of the classic Limit Break. In ''The Drowned City'' it's no longer character specific - you have equip 'scrolls' to certain characters to use them. Most scrolls need to be equipped 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 strenght, 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.
** {{Limit Break}}s [[TalkingIsAFreeAction Are A Free Action]]: 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.
* 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''.
* MetalSlime: The Gold F.O.E.s 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.
** 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. You can also turn any F.O.E on the world map into a rare breed if you throw them rare food that they like.
* 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.]]
* 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, according to other players, 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.
* 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...).
** This is discontinued by ''The Drowned City''; there is no option to apply your OldSaveBonus.
** Interestingly, while data similarly cannot be carried '''into''' ''Legends of the Titan'', the interface explicitly says that carrying your ''[=LotT=]'' data forward into ''other'' titles could be a possibility in the future, especially as party data can be saved to the SD card on the 3DS for easy importing (which ''[=LotT=]'' will do when prompted).
* 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:[[BackFromTheDead He gets better]], and helps out against a BonusBoss if you request his aid.]]
* OurMermaidsAreDifferent: [[spoiler:Deep Ones in ''The Drowned City''.]]
* PaletteSwap: A customization option in ''The Drowned City'' and ''Legends of the Titan'', with each playable character boasting an alternate set of colors.
* PettingZooPeople: The Sentinels in the fourth game, which are known as Bushi when signed up to the guild.
* PimpedOutDress: The Princesses sport some really fancy dresses, complete with armor.
* PowerCopying: Grimoires in ''The Millennium Girl'' 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.
* QuirkyBard: Strongly averted in ''Etrian Odyssey'', where Troubadours are the second-biggest [[GameBreaker Game Breakers]] behind only Medics who know Immunize. They were [[{{Nerf}} nerfed]] hard in ''Heroes of Lagaard'' due to Healing and Relaxing being removed, but they can at least pull enough of their own weight to be worth the party slot 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."
* 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.
* 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.]]
* RecurringRiff: ''The End of The Raging Waves'' from the third game is remixed to ''The End of The Raging Winds'' in the fourth game.
* RemixedLevel: Most of the maps in ''The Millennium Girl'' are very different in terms of routes from ''Etrian Odyssey'''s, forcing the player to make their maps from exploration instead of memory.
* RespawningEnemies: Any slain F.O.E. in ''Etrian Odyssey'' will come back after three in-game days, unless it was actually a plot-related boss, in which case it will come back after eleven. Increased to 7 days in ''Heroes of Lagaard'' and 14 days in ''The Drowned City'' and ''Legends of the Titan''.
* {{Retraux}}: This whole series more or less 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 an F.O.E. You better hope your back is clear or that you have the specific skills that allow you to flee from battle to the previous floor, or you're trapped.
** And in the fourth game, 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 over the entire map and have a short cutscene showing their arrival whenever they spawn. If one of them catches up with you, you don't even get a HopelessBossFight - you simply get a message box informing you that the dragon has smashed your skyship and you, and you get sent back to town with at least single character reduced to 1 HP and a random number of them dead. You also lose any of the food you collected on the world map, with the exception of the food you've collected for quest purposes. Then again, it's preferable to getting an instant Game Over.
* 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.]]
* {{Sarashi}}: The Ronin class.
* 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 being consistently nice 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]] fans will recognize from ''Trauma Team''.
** [[http://www.youtube.com/watch?v=Kj9COPsEsoc#t=0m31s Take a look at this vid]] from the indicated point on, and look at the names of the [=PCs=] that were chosen for the demonstration. [[Webcomic/{{Homestuck}} Terezi, Kanaya, Gamzee, Equius, and Karkat]]. All of them from ''Webcomic/{{Homestuck}}'''s fifth chapter. 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 [[RanmaOneHalf certain pig-tailed Martial Artist...]]
** 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/]].
* 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.
* 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.
* 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''.
* ThereAreNoTents: Aside from the deathtrap/field of flowers in the first strata, all other games besides ''The Drowned City'' play this straight.
* TimeLimitBoss[=/=]TimedMission: In the last Area of the new dungeon in ''The Millennium Girl'', the boss, [[spoiler:the [[ArtificialIntelligence AI]] called [=MIKE=]]], must be fought and defeated within 50 Turns, which includes steps. There are two ways to get to it: [[spoiler:go straight for the boss and fight the [=F.O.E.s=], but have a worn-down party, or go around the [=F.O.E.s=] at the cost of several turns.]]
* TimeStandsStill: 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.
** This is the Ronin's LimitBreak in ''Heroes of Lagaard''.
* 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, even conditional ones, if it's killed on the same turn the item is used. There's also a terribly limited number of them, and, like Coupons, starting a NewGamePlus doesn't restock these chests. While it is possible to unlock them for purchasing once you reach the [[BonusDungeon sixth stratum]], doing so requires items dropped by F.O.E.s from that area. However, they are sold in limited supply; if you buy too many, the shop will run out of them, forcing you to gather the materials again. [[SarcasmMode Have]] [[ThisIsGonnaSuck fun!]]
*** It returns in ''Legends of the Titan'', but are ''much'' more rare. On the bright side, the chests containing them are restored on a NewGamePlus. You still need to kill the same F.O.E. in the BonusDungeon to get more, however.
* 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'', ''Legends of the Titan'' and ''The Millennium Girl'' move the hospital into the inn though.
* TraversibleWorldMap: ''Legends of the Titan'' sports this as one of its main differences from the rest of the series. The bulk of the game takes place navigating the large map with your airship, the series' traditional "Stratums" now replaced with "Lands", or the various zones of the map.
* 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 any such 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''.
* 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 the first game can be used to heal instead, though.
* VoiceGrunting: Present in ''The Millennium Girl''.
* WakeUpCallBoss: So you got past the killer Great Lynxes and Largebills on the first two floors of ''The Drowned City'' and you're more or less 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 yes, this is still an Atlus game.
** Even sooner, the first F.O.E. on floor 2 is capable of wiping out your party with ease. Unless you have a Ninja with Kagerou.
** In ''Legends of the Titan'', the Berserker King, the first boss, gives you a crash course in isolating the boss from nearby F.O.E.s, while [[spoiler:the Hollow Queen]] teaches that no, Binds are ''not'' a UselessUsefulSpell, and you will need to utilize all three types of bindings if you want to have any hope of defeating it.
** Fenrir in ''The Millennium Girl'' reminds the player that even though it can be far easier than the original, taking it lightly can and '''will''' kill you, especially on Expert difficulty.
*** Right after Fenrir in ''The Millennium Girl'' is Coeurl. Unlike Fenrir, his gimmick can't be stopped by items, and has a powerful attack that hits the whole party that's used [[FourIsDeath every four turns]].
** There's also [[spoiler: Logre]]. Most players who fought the HopelessBossFight version the first time will expect the non hopeless version to be roughly the same. And them [[spoiler: He uses Shock Drive]] and deals damage to one of your characters in the ''thousands'', thereby showing the player that this boss battle is on an entirely different level than any other fought so far. To put in perspective, the Dungeon's actual boss is a joke in comparison, if only for the fact [[spoiler: Logre is fighting alongside you with the same moveset he displayed in his boss battle as a GuestStarPartyMember with no playable-version nerf.]]
* 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.]]
* 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: ''Etrian Odyssey'', sixth stratum. 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.
* YouShouldntKnowThisAlready: [[spoiler:Before ''Legends of the Titan'''s release, the Imperial class was freely discussed by sources and fans alike. However, once the game released this quickly stopped once it became apparent that the very ''existence'' of the Imperials is a ''major'' plot point in the story.]]
* 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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