Effigy

The effigy is an undead hybrid of a ghost or specter and a fire elemental, it is an undead creature that hates living beings 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 face and composed of burning, multicoloured 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.

Additional Information

Perception and Sensory Capabilities

Hearing, sight, able to sense life energy