Amelyssan

Amelyssan the Blackhearted was a priestess and Deathstalker of Bhaal whom that deity entrusted with the task of resurrecting him. Having foreseen his death during the Time of Troubles, Bhaal came to Toril years before the event and mated with mortal females of different races, producing offspring called Bhaalspawn, who were to slaughter each other and fuel his rebirth. Amelyssan's task was to perform rituals that would complete Bhaal's return. However, her own goal, at least towards the end, was to gather all the power of Bhaal's essence released from his children into herself and become a goddess. Posing as a benefactor of the Bhaalspawn under the name Melissan for most people, and gathering together The Five with promises of great power once Bhaal was resurrected, she manipulated events to the point where nearly all Bhaalspawn were killed, and came close to achieving her goal. However, one Bhaalspawn defeated not only most of The Five - which fit Amelyssan's plans - but also the prospective goddess herself, slaying her in the Mana Forge and gaining control of all of Bhaal's essence for themselves. Having been welded to the essence, her soul was annihilated permanently when it was removed.