Undead (Dungeons & Dragons) - Effigy

The effigy is an undead hybrid of a ghost or spectre and a fire elemental, it is an envious undead creature that hates living creatures and lusts after the life energy they possess. It possesses the bodies of living creatures and takes over their lives, but eventually the possessed body catches fire from the inside from the corruption, turns into a flaming zombie, and is destroyed, and the Effigy must find a new host.

An effigy appears as a ghostly, translucent humanoid shape with a fiendish countenance and composed of burning, multicolored flame. Its eyes glow white within the flickering fires of its insubstantial body, but it has no other discernible facial features. Clawed, fiery arms can also be made out.

The Effigy's preferred form of attack is to possess a living body and then use this body to attack. A creature infused (possessed) with an Effigy does fire damage, and has an energy draining touch. A wisdom check can be made against an Effigy to drive it out of a host, or to prevent it from entering in the first place.