Undead (Dungeons & Dragons) - Devourer

The devourer is a horrible undead creature which lurks on the Ethereal Plane and Astral Plane.

In Dungeons & Dragons, the devourer resembles a grey, horrible mutated, malnourished, sickly, shambling humanoid. The barely-there skin on its chest is opened up, revealing the completely dry and empty ribcage. It has the ability to spray a poisonous fog that instantly kills its foe, trapping it in the Devourer's ribcage and sustains its unnatural life force and gives it the ability to cast five spells. A creature trapped within a Devourer's ribcage is unable to escape and cannot be resurrected without the use of a very powerful spell. In the game, devourers speak Common.

The devourer appears in the Monster Manual for 4th edition, including the spirit devourer, the visceral devourer, and the soulspike devourer.