The Unnamed Saga
Green Flame Entity
A being of unknown source and type composed of swirling, transparent green fire. It appears able to posses or at least occupy the bodies of other living creatures.
When the Chained Wizard Calavakos was destroyed by a band of adventurers who entered his prison, a huge and terrible Green Flame Entity flowed out of his body and evaporated.
The Green Flame Entity apparently had possessed and controlled Calavakos, and had been responsible for the army of demons Calavakos had summoned to wage a burnt earth war on the fey wild. Though little else is known of the malignant spirit, the cleric Klemnon Melk could sense his deity’s own revulsion and loathing for the thing when the Green Flame Entity fled from Calavakos.