View source for Ancient Domains of Mystery/YMMV

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* [[Demonic Spiders]]: Including literal spiders, who get summoned in hordes and have poison attacks; jackalweres, who summon legions of increasingly-powerful jackals, the greater claw bugs and killer bugs in the Bug Temple, and pretty much everything you meet in the Final Dungeon.
** Ghosts can pass through walls and have an aging touch, making them this to any player race with a short lifespan. A "tension room" full of ghosts can easily surround an orc or troll in a corridor and age him to death.
** Ogre magi are at ''least'' as tough and strong as normal ogres, [[Healing Factor|regenerate their wounds]], ''and'' can cast invisibility on themselves and ice spells at the player.
** Dark elven priestesses, princesses and wizards (called [[Fandom Nickname|spider factories]]) are particularly nasty summoners. Not only they summon hordes of spiders, which fill the area with immobilising webs and use poison, but have themselves nasty attacks such as paralyzation and energy ray spells.
** Annihilators can destroy any non-artifact item you have equipped if they get within melee range. Thankfully, they aren't particularly resilient or powerful, but if one of them rips apart your amulet of death ray resistance or girdle of carrying, expect things to get ugly ''fast''.
** Stone oozes ignore armor, hit surprisingly hard, and can paralyze on touch. Whether or not they are horrendous blobs of death or mildly threatening melee enemies depends entirely upon whether or not you currently resist paralysis.
** If you ever get a message about 'a deadly and chilling silence', ''run''. Any melee attack in the room gets a massive damage multiplier, turning even the weakest of monsters into fearsome threats capable of splattering end-game characters within a few turns.
* [[Game Breaker]]: Raising your speed.
** The Raven birthsign lets you get the rune-covered trident at level 16, instead of level 36. Said trident is normally a highly desirable end-game weapon, with a host of powerful intrinsic properties, including guaranteed critical hits against undead and demons, two of the nastiest enemy types.
* [[Goddamn Bats]]: Summoners of any kind can quickly become unbearable. Karmic creatures are just as bad, because hitting them causes your character to get cursed and/or doomed, which is a highly undesirable [[Standard Status Effect|status effect]]. And also {{spoiler|cats. Killing even one of them makes an enemy of a high-level NPC in the end game instead of a very valuable artifact ring}}.
* [[Good Bad Bug]]: Let a dragon pick up a pile of gold. Kill the dragon. Notice that it gives you twice as much, every time. Lots of fun with vaults, although you've got to be careful if the dragons have a breath weapon that can melt/dissolve the gold.
** If you are a Monk and have a nonhostile creature standing next to you, typing "n" to the "are you sure?" message when you use your circular kick results in the kick going off anyway. Bad, right? Not when you notice that it takes '''zero''' turns to execute and only hits hostiles.
** This has since been patched, but there used to be no upper limit to how fast a Drakeling could get from being exposed to heat. If you parked your character in the Tower of Eternal Flames for a while, you could then completely overpower just about anything in the game with your ludicrous movement and attack speed.
* [[That One Boss]]: The bosses of the two examples of [[That One Level]] below. {{spoiler|The Ancient Chaos Wyrm and Nuurag-Vaarn are both powerful spellcasters, Nuurag-Vaarn even more so since he casts both Darkness and [[Death Ray]]}}.
* [[That One Level]]: The Tower of Eternal Flames and the Mana Temple. The former deals constant fire damage to the player and burns his items, and the latter {{spoiler|cripples spellcasters especially, as the magedoom eyes will drain their magic points}}. Both contain heaps of tough monsters, {{spoiler|Chaos altars when stepped on will have the PC instantly sacrificed}} and two of the nastiest mandatory bosses in the game. Both places are usually regarded as the big turning points that put the power and skill of both the player and his character to the test: the tower especially, because beating it is required for reaching the latter half of the game and players are usually only about level 20 when they run out of other options.
* [[That One Sidequest]]: Most of them. Even trying to save the little girl's puppy has a time limit and puts the PC through a dungeon with a guaranteed giant ant hill on the second level. Giant ants have sturdy natural armor and they are ''mean'' (additional fun awaits closer to the bottom of the dungeon).

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[[Category:Ancient Domains of Mystery]]
[[Category:YMMV]]