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- The infamous "Reckoning Bomb." Reckoning was an ability which gave an extra attack on the next swing after getting hit with a critical attack. Problem is Blizzard forgot to put a cap on the number of charges you could accumulate. That is to say, a paladin could spend a few hours doing nothing but standing in one spot getting crit while someone healed him, then go and hit a raid boss. All the thousands of Reckoning charges would be emptied out instantly in one hit, killing the boss on the spot. This was patched within hours of being used.
- On the Horde side this manifested in the Shaman's "Windfury" ability, which gave each autoattack a chance to provide an extra strike, except that the ability could trigger off its own extra attacks. While not as bad as the Reckoning Bomb, a Windfury shaman could easily one-shot somebody if he got lucky. Both Reckoning Bomb and Windfury were highly typical of early World of Warcraft, when moves existed where depending on RNG you could find yourself instantly killed with nothing you could do about it.
- On the PvP front rogues at one point enjoyed the possibility of "stunlocks" in Player Versus Player, which meant they could use their various stunning/disabling skills to make an enemy completely unable to defend themselves for an unlimited amount of time. If a rogue caught you alone, you were dead - end of story. The infamous 'World of Roguecraft' series of videos featured a player using stunlocks along with the Eviscerate move, which at the time did static damage no matter what the user's attack stats were, to kill players while naked, using the weakest dagger in the game. This was counteracted by so-called Diminishing Returns in PvP, which make such abilities less and less effective the more they are used against the same opponent in a certain timeframe, as well as special PvP equipment that allows players to break free of one such effect every few minutes. Players could similarly use Fear spells to permanently lock down players until the implementation of diminishing returns.
- For a period of time in 2v2 arena, all the top teams were Warrior/Druid, caused by a coincidental occurrence of warriors and druids becoming kings of PvP damage and healing (respectively) at the same time. The Warrior had high armor, high damage, and great debuffs. The Druid had instant-cast heals, high speed in cat form to escape targeting, high armor in bear form if it couldn't, and also had great debuffs. The classes weren't game breakers on their own, but as a team in a 2v2 scenario and played by skilled players they were almost unkillable. Video exists from this period of Warrior/Druid teams fighting each other and the match going on for hours.
- Patch 3.0 gave classes their level 80 abilities at level 70 before Wrath of the Lich King was released. This patch became known as "Wrath of the Retadin" because of the absurd (and unintended) buff this gave to paladins. It was so bad that other classes didn't even bother to try to fight them, leading to battlegrounds 3/4 full of Paladins. Although the developers intended for the game to balance out as the characters were leveled, the outrage and forum outcry was enough that Blizzard took the nerfbat to Paladins early, making them even weaker than they were before the buff (previously Retribution Paladins had always been considered to be jokes). They weren't fixed until the Secrets of Ulduar patch rebalanced the skills of every class.
- Zul'Aman was also famous for creative ways to use certain skills to subvert major parts of the dungeon's challenges; pulling enemies using pets to get past walls, preventing them from summoning Goddamned Bats, certainly helped, but then there was the challenge of one boss being that it was a 5-man team, and you could (now fixed) literally make all but the "leader" despawn using a creative trick involving a frost trap and a naked blood elf.
Wrath of the Lich King
- Initially mages had a talent which caused them to increase their damage if they absorbed from a damage shield like Mana Shield. Mages also at max level got a spell which lets them steal a buff from an enemy for up to 2 minutes. One of the NPCs in the first raid instance would occasionally give themselves a million point damage shield. Cue a mage who steals this spell and keeps stealing it again before it wares off to be pretty much invulnerable and powerful enough to solo a boss meant for 25 people by dragging the NPCs to the boss. This was quickly fixed by making the spell not stealable, and also making the talent have a limit to how much bonus damage you could get. At least one player showing off got banned for doing this exploit.
- Early Wrath Starfall gave Moonkins the very useful (but unintended) ability to break enemy Rogues out of stealth in a huge area, along with a chance to stun. It didn't last long however, and the spell became very underwhelming without these traits.
- Something similar happened with the Death Knight spell Blood Boil, which hits everything in a 10-yard radius around the Death Knight. When the class was first introduced, the ability would fail to cast if there were no targets in range. Players quickly realized this meant they could spam the button if they suspected a stealthed Rogue or Druid was nearby, and it would hit them and knock them out of stealth the second they came within range. Blizzard eventually changed this so that Blood Boil will cast (and consume Runes, making it non-spammable) regardless of whether it hits anything, but will only generate Runic Power if it does.
- For a very short period in patch 3.3, Fire Mages had an unintended effect in one of their talents (Pyroblast can be cast instantly with two consecutive critical hits, at a cost of 0 mana) that caused their primary nuke spell (which normally has a long, 5-second time to cast) to be available as an instant-cast more often that intended, leading to the possibility of a situation where the Mage can repeated spam this high-damage ability for significant burst damage. As a result, a hotfix was quickly released to prevent damage over time critical hits from counting towards consecutive critical hits.
- The Tol Barad PvP zone was originally grossly imbalanced in favor of the defending force. (This was the developers' intention, to make players value holding it instead of relying on them having it within a few battles.) The goal of the zone is to capture three fortifications, which form a triangle around a central point. The defenders spawn in the middle. Here's the problem: In order to cap the flags, the attackers need to outnumber the defenders. Fair enough, except that in order to win the attackers need to have all three forts capped at the same time. The attackers respawn right outside the closest fort they're trying to cap, whereas the defenders respawn in the middle of the map. This means that the defenders are equidistant from all flags, while the attackers are closer to the fort they're trying to capture and further away from those they aren't. This resulted in a merry-go-round with the attackers desperately trying to capture the forts in front of them while the defenders simply retook the bases they just left. Blizzard eventually fixed it, mostly by altering how fast the keeps convert - the more forts capped, the faster they covert, meaning once you already have 2 forts, the third caps quite fast.
- During patch 4.3, a hotfix patch for the Dragon Soul raid had the unintentional effect of causing the Censure DOT from the Retribution Paladin spell Seal of Truth to start exponentially reapplying versions of itself, allowing Ret Paladins to start doing so much damage that they could solo raid bosses, and hitting other players in PVP with so much damage that it would disconnect them from the server. Fortunately, it only lasted for five hours before it was fixed.
Mists of Pandaria
- At the start of Mists of Pandaria, Holy Shock, a spell for Holy Paladins was made this. It dealt incredible amounts of damage and in PvP, could easily take off 60-90% of a target's health, if not one-shotting them outright. Its damage output was cut by a full 60% later, but for a while it was a bloodbath.
- Beast Mastery Hunters due to one, incredibly great skill. Stampede which summoned out 6 pets for the hunter and increased their damage by 75%. The math for this? 175x6x0.5 (how much the pet is doing x how many pets x % of the hunter's damage) is 525% damage. The Hunter could then pop Deterrence and become literally invulnerable while his pets tore his opponent apart. Has gone through a lot of tweaking to be balanced yet faithful to the concept.
- The Jademist Dancers on the Timeless Isle have an extremely slim chance of dropping themselves as a pet. If you luck out and get one or buy one on the Auction House, it has respectable Power even without a P/S (+45% Power and Speed) or B/B (+25% Health, Power and Speed) breed and all of its possible breeds give it above average Speed. When it comes to its moveset, it starts off with Steam Vent, which does a massive amount of Aquatic damage that gets buffed even more by the Cleansing Rain weather effect caused by when it learns Acid Rain at 4, and at level 2 it learns Jadeskin (compared to most other pets who don't learn damage reduction abilities until later), which not only reduces damages taken by direct attacks but can also completely nullify Damage Over Time effects as well, so you can laugh as the Dancer easily shrugs off poison from snakes, spiders and scorpids.
- The Unborn Val'kyr. Its attack Haunt instantly kills it and deals damage over time to the opponent for 4 rounds. Here's the kicker: it brings the Val'kyr back to life after the timed effect ends (or if at least 2 turns have passed on the dot), even if she was killed before using it and was on her invincibility grace round. It is an extremely difficult pet to fight as a result, especially since it forces the player to use Critter-type moves, the most underused type, to kill it quickly.
- Grommloc, the BlizzCon 2014 murloc pet that's dressed as Grom Hellscream and fights with a minature Gorehowl. His first ability Vicious Slice does so much damage even at early levels that it might also qualify as a Disc One Nuke, while his second is Clobber, which is a stun, and his third is Giant's Blood, which is both a heal and a damage buff, the former effect overlapping with the Humanoid type's ability to regenerate health when it deals damage and giving him serious longevity, and the latter making Vicious Slice hurt even more. If you need a Beast attack he later learns Smash at 10, if you need a harder hitting Humanoid move he learns Mighty Charge at 15, or you can keep using Clobber for when he learns Takedown at 20, which deals double damage against stunned opponents. The fact that he has lower than average health won't matter when you're destroying most pets without a great Undead move.