Shoth-Gorag

Shoth-Gorag is a creature from the Far Realm. It was summoned to Syra by Tephra to kill the Challengers of the Unspeakable so that she could retrieve the soul gems of Acererak from their corpses. However, Shoth-Gorag was itself slain by the Challengers; its body dissolved, leaving only its heart, from which it could regenerate in time. Rather than destroying it, the Challengers instead brought it to Myra Brigg at the Trine Academy in Silverstone in order to use it in a ritual to close Tephra's gateway to the Far Realm. The heart was placed in a secured vault, guarded by a variety of wards in case Shoth-Gorag begins to regenerate.