Vile spirits are semi-unique undead monsters that first appeared in ADOM v. 1.2.0 r48. They are the spirits of past, slain player characters that have now been twisted by Chaos into evil monstrosities. Any dungeon where a player character once died is capable of spawning a vile spirit in future playthroughs, and the spirit is always named after the slain player with a suffix based on their former race. For example, Dwarf Vile Spirits have suffixes such as "Of the Shield-Born", while Troll Vile Spirits have suffixes such as "The Wretched".