Ysgithyrwyn was a daelkyr lord of Xoriat. Once on Eberron during the Daelkyr War, it is presumed that he was banished back to Xoriat by the Gatekeeper Druids. However, Sinnoch, a dolgaunt agent of Ysgithyrwyn, stumbled across a portal between Xoriat and Eberron. In 998 YK, Sinnoch and his unknowning pawn, artificer Elidyr Brochann, tried to bring Ysgithyrwyn from Xoriat to Eberron in a similar manner. They were defeated by Lirra Brochann, Elidyr's niece.