This papercraft is based on the RPG game Dungeons & Dragons, designed by Eddnic. In the Dungeons & Dragons fantasy role-playing game, 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.
You can download this papercraft from here: Dungeons & Dragons Fantasy RPG - Devourer Free Papercraft Download