Legends of the Dreaming Sea
Thegum the Eternal
Immortal, bodyless sorcerer-prince
Thegum is invulnerable and immortal, but unable to interact with the physical realm unless he possesses a ritually prepared host, or invades someone’s dreams.
Thegum was a contemporary of Yoroon-Shalal, Sorcerer-King of Ys and previous incarnation of Kyros. It seems he had managed to render himself totally immortal.
So when he was charged with infernalism and treason, Yorron-Shalal performed a mighty Solar circle working to strip him of his body and disperse his consciousness over Creation. He was then stricken from the records of Ys.