Warden

the warden is a powerful and ancient beast who lives in a deep dark cave where there used to be an ancient city the warden used to be a protector of that city until one day the warden went completely rogue killing everything in it's sight and every time the warden killed one civilian one after the other the warden realizes that this weird sparkly blob kept spreading and the very next day the warden killed us civilian next to it and it spreaded to the warden, kill after kill it kept spreading on to the warden every time the warden killed a civilian next to it until the warden finally turned into the warden we know and the warden has the ability to use souls to kill and the warden has bones from those who the warden had killed the reason it's called the deep dark cave is because it's deep and dark but another reason it's called dark is because the warden left no survivors at all