* BaseBreaker:
** Due to it originally being bugged to deal twice as much damage and requiring two other tough bosses to be defeated in the same game session, players tended to be frustrated by the long trek needed for each attempt to battle Shadow Storm.
** The Necromancer Vs. Paladin war was one of the greatest {{Base Breaker}}s in recent years. To the point of it having made the writer of the event swear off writing multisided wars at the end. That is until he wrote up a four sided faction war that has just about as strong opinions for each side...
** Engine 39 also was a rather big one, due to heavy changes in the {{Metagame}}, ending in the staff member behind most of numerical changes fired and another who worked on making it work to resign a short time later.
* ContinuityLockout: Since AQ is the [[EarlyInstallmentWeirdness first game]] in a long list of ''other'' [[Creator/ArtixEntertainment AE games]], new players uncertain about how ''VideoGame/DragonFable''[='=]s shared [[AnotherSideAnotherStory timeline]] (or even how [[VideoGame/AdventureQuestWorlds AQWorlds]]) had fitted into the whole ''timeline'' of events, require some [[ViewersAreGeniuses thought]] about the whole storyline... This can be [[MindScrew very confusing]] for people.
** The fact that quite a bit of the back story can only be found at [[AllThereInTheManual the forums]] certainly doesn't help.
* DemonicSpiders:
** Gogg, the most well-known example of this game's GlassCannon, as it hits like a truck but dies really quickly. There are many deadlier variant, such as Armegoggon. Then Shadow Gogg came with his random chance to inflict Celebrity (allowing it to act for another turn). Be thankful that Shadow Gogg only hits with Light and Dark, unlike the regular Gogg, which will use Ice-, Water-, and Energy-element attacks.
** Elemental Shifters, especially Windshifter and Fireshifter. For short, these guys are basically monsters that attack with two opposite elements (use one for normal attack, another for their SP attack, with are stated in their names). Darkshifter is a normal JackOfAllStats, Energyshifter's attacks can drain MP, Windshifter is a tank with really high Melee/Ranged/Magic defense, and Fireshifter is a deadly GlassCannon. Fighting them is easier now thanks to glowing-SP-bar-when-ready-to-use-skill update, but this only works when facing one enemy. When fighting groups of Shifters, one will throw its SP attack while the other one use its normal attack, and their combined SP regenerates twice as fast!
** Sneaks (A type of snake) are probably the most common, but they're getting edged out of their position as "King of all monsters that make players tear their hair out." The most obnoxious thing about them is that they're very, very difficult to hit with anything except a ranged attack unless the player's character has high dexterity. However, some more-recently-introduced monsters are just as hard to hit or worse, and they don't have the ranged weapon weakness. And since status effects were introduced fairly late, monsters that use them are really, really obnoxious. And then, we have the Ancient Sneak from "Play the Harpie" quest...
** Mighty Shadow Hydra have the ability to stack bleeding status effect which inflicts harm based damage whenever it hits the player with its attack, and all of its resistances are lower than 100%. Bring it down to half health, and it summons its second head, increasing its damage output and bleeding, to the point that it can deal somewhere around 500 damage per turn. Put simply, the player needs to handle it quickly before its damage output snowballed out of control.
* EnjoyTheStorySkipTheGame: It's commonly accepted that while the gameplay of the game can be considered unexceptional, the lore can stand on its own quite well.
* GoodBadBug:
** During the "Divide by Zero" war, the monster pool was abnormally strong, leading to waves of monsters that were 30 levels above the character's level. This also meant farming was made easier, but slowed war progress.
* ''VideoGame/AdventureQuest'':
** The Power Katana weapon caused some odd bugs. In ''[=AdventureQuest=]'', the armor the player character wears determines the number of hits done with each attack during a turn, but it also determines what percent of the weapon's damage is done per hit. The Power Katana, probably due to it being the only item that scaled with your level at that time, did not play nice with the latter. Instead of damage being divided over each hit, each hit did full damage, which was insanely broken if the player paired it with an armor that performed several weak hits, allowing you to do up to six or seven times standard damage. The bug was, however, eventually patched.
** Weekly releases tend to have a few hiccups before a patch later in the day, such as the 2015 Giftbox armor bugged to deal 100% damage for two hits rather than 50% damage each. Banshee Form armor had a bug that lied unnoticed for ''months''. Banshee Form, on paper, was a strictly inferior Darkness-element armor compared to others, but in implementation, it was bugged to deal double damage compared to other armors of the level. People who actually used Banshee Form would have a much easier time clearing the game before it was patched.
* JunkRare: Due to game engine updates and that many old items are only suitable for a range of levels, many old rare items become this.
%% ZCE: * MagnificentBastard: Drakath (now a dragon)
* SequelDisplacement: Due to the original game being unrefined at best, other ArtixEntertainment games have eclipsed the original ''[=AdventureQuest=]'' in popularity. However, many of the characters prevalent in the other games stem from the original game.
* ThatOneBoss: The "Unbeatable" and Void monsters are mostly designed as these.
** Shadow Storm is one, which is a big reason for its status as a BaseBreaker. The way it works is, it starts the battle with a powerful two-hit SP attack that randomly hit with light or darkness element, and it spent the next four turn to recharge its SP and HP until it can use its SP attack. Rinse, and repeat. Its SP attack also have an effect to reduce the player character's damage output, and you have 25% chance to get stunned and do nothing. It actually have quite a low starting HP, but it has a much higher maximum HP which means it can regenerate itself until it has three times its starting HP if your offensive power is unable to compete with its massive HP regeneration.
*** Shadow Storm was even worse. In its original version, because of a programming mistake which caused its damage output to be doubled, enough to outright one shot a fragile character if they are caught in the wrong armor set up. This bug has been fixed, and the Shadow Storm has been re-adjusted since the damage fix.
**** And All of this was before the patch 39. Imagine fighting the original Shadow Storm right now....
** Ryn the Undying is one for most players due to his complex system of attacks. His default attack is randomly chosen between Fire and Dark elements, making resistance against both hard. He also uses special attacks depending on if he has MP and SP and if he had inflicted a {{Standard Status Effect|s}} on the player character, so the player needs to watch every piece of information on the screen to make sure what attack he'll use next. Then there's the fact his special attack has a chance of downright killing any player character that isn't a pure human, but the game never tells the player ''why'' he can OHKO the player character. Unlike most other bosses of this difficulty, defeating him is required to unlock more Celestial Haven quests. Overall, he's GuideDangIt in boss form.
** The boss of third Frostval 2015 quest, Ancient Fruitcake Zard. It can paralyze the player's character over and over again with its bite attack. The only way to avoid paralysis is to lower the character's water resistance enough, or to otherwise let pets and guests deal enough damage.
* ViewersAreGeniuses:
** The [[YourHeadAsplode Devourer Saga]] is enough to induce a few headaches, as well as the constant [[ShoutOut references]] to other TV-shows and the HurricaneOfPuns help slightly.
** Falerin's ramblings in other contexts will go over people's heads without a bit of esoteric knowledge. For instance, he mentions whether it is proper to use 'antediluvian' as a synonym for 'old' if Lore didn't have TheGreatFlood; the word 'antediluvian' literally refers to 'before the flood'.
* ParanoiaFuel: Somethings. During Halloween 2011, 500,000 of them were released into the game. They appear small and harmless enough, but [[FaceStealer they EAT other animals or people and take on their characteristics.]] They could be anyone. They could be everyone.
* {{Vaporware}}:
** "The Sweep", an ongoing rebalance operation which is supposed to be applied to older items as well as new ones. Whilst all new items are at the new standards, most older equipment has yet to be fixed. However, as standards end up changing at infrequent intervals, even 'swept' equipment can become outdated.
** Everything that Lord Barrius was working on after he was fired falls in here now, as almost all of it is going to have to be reworked and putting it off even longer (the Paladin and Necromancer Class sweeps, the Knight Class storyline) or just neglecting it outright (virtually any Shadow-related storyline or ones that directly involved any of LB's Character).
* WordOfGod: Mostly, Falerin. (In this case, literally. Falerin, the head writer, is also the NPC Caelestian God of Evil.) With Lord Barrius and Eukara coming a close second. Of course, none of the other writers (and the team)'s comments are considered any less informative/important despite this.