As RP character, Zahadrin is a long lost heir to Kaim. He is also a magic master, and part demon. His demon form has been dormant for some time, but awakens when agitated or annoyed.
True origin of Zahadrin: From my series 'The Dark Times Chronicles'. He was a great and power hungry wizard who never was able to eliminate his enemies. A spell he cast on his children would be past down until a certain time for his great grandchildren to destry them for him.
Also knows special abilities known as Noble Phantasms. (For knowledge of refference, look at Fate/Stay Night Archer and Gilgamesh)