Fulmin is a character featured in the official lore A Return To Stone. He was a mage who was granted immortality by Razmus, a demon from the Infernal Dimensions in the form of the ability to transfer his soul into other bodies. Should he fail, he will be tormented by the demons for eternity.
During the lore he attempts to take over a long-lived TzHaar body, and discovers the abnormal TzHaar hatchling Ga'al-Rek. Fulmin offers to take Ga'al-Rek to the surface of the volcano, but is killed by a TzHaar.