Dethtoyew is a chaos druid met and destroyed in the Open Souls quest wishing to get the Soul Altar. He is one of the few mages to use the Dark Magick spell, killing most of the people he fires it at. Once the druids and Guthix Warriors kill the undead Warriors, he kills all of them and dealing harsh damage to Sanfew. Once he sees you, he will fire Dark Magick spell at you, but you will bring out your shield thus making it Fire back at him which kills him. His final words were "I SHALL RET-" which could mean a newer series of the Quest.