Immolith

The spirit's of deceased demons occasionally fuse as they fall back into the Abyss that spawned them. The event is unpredictable and unstoppable the result of this hellish fusion is the horrid demonic entity called an Immolith. As immolith's are formed from the souls of multiple demons, they despise the living more then any other demon and are often more likely to be seen with powerful undead creature rather then serving other more powerful Tanar'ri.

Appearance
Immolith's look like giant flaming skeleton's, often sporting multiple arms immolith's use there many claws and there ability to control death fire as there primary weapons in battle. As they are constantly covered in flames immolith's seem to glide or float but really walk as this allows them to use there immense size to tower over there enemies.