Thaquam

Thaquam, The Old King of Dustbourne is the 2nd optional boss of ELYTRA: Phantom Reliques, encountered in the first part of The Dustbourne Mines during the main story. You have an option to not kill him and let him live, but he will still attack you since he has become a skeleton and can't think like a human anymore. By killing him, he will drop The Crown of Thaquam.