Melissan

Melissan, also known as Amelissan the Blackhearted, was a priestess of Bhaal and the main antagonist of ''Baldur's Gate II: Throne of Bhaal. ''Before his death, Bhaal required someone to guard his essence in order for his resurrection to occur, and entrusted the task to Melissan, meaning she had access to his essence. Eventually, she wanted the power for herself, and pretended to protect the Bhaalspawn while turning them against each other, so their divinity would give her more power.