Barstan Tungs is a NPC in Divinity: Original Sin 2.
If you put him out of his misery, you can talk to his spirit and hear his story. He was a famous poet/bard because he made a deal with a voice in the darkness that was the demon inside the Doctor. He was asked to sing about the danger of the Void and the Black Ring, but one day was asked to sing a song of Divinity. You can pass two speech checks to hear it, and then he can go with peace to the Hall of Echoes.
found him in the cellar of the doctor, imprisond and silenced