From GuildWiki

Abominations are hideous creatures of flesh. They are an amalgamation of body parts and organs from living creatures animated by magic. While very similar to Golems, Abominations do leave behind a corpse that can be exploited by necromancers. It seems that there are two types of Abominations, there are horned Abominations and Abominations with a head.

Types

Region	Type	Subtype	Collectable Drop
Prophecies Campaign
Post-Searing Ascalon	11 (24) Abomination	With a head	Gruesome Ribcage
Ring of Fire Islands	24 (26) Flesh Golem	Without a head	Seared Ribcage
Factions Campaign
The Undercity	24 (26) Fire Golem	Without a head	Seared Ribcage
Realms of the Gods (Core)
Underworld	27 (30) Dead Collector 27 (30) Dead Thresher	With a head Without a head	Gruesome Sternum

For a list of all types of Abominations, including bosses and quest-specific Abominations, see: Category:Abominations

Notes

• Despite their appearance, most Abominations are not Undead, and are not vulnerable to holy damage; however, the ones in the Underworld are.