The Witcher: Atonement

Eric Weiss was once the respected bishop of St. Cuthbert's Church, but he was bewitched by a demon during a demon-killing ceremony. He recalled pushing the little girl Emma into a well for bread when he was a child. The demon Siscrena took the opportunity to steal Eric's darkness and transformed him into Yvel Grey. Yvel Gray relied on vicious strategies and insidious means to make the people of Prodi town kill each other, leaving only Eric and the priest. In the end, the priest misunderstood Eric in the letter left by Yvel and killed him, and finally died in Eric's arms. Eric Weiss was thus held accountable by the archbishop and removed from his position as bishop. From then on, Eric vowed to hunt down Yvel Gray until his death.