Executioner

From publisher blurb:

The executioner is said to be a singular being that exists to bring terror to the world, one victim at a time. It has reappeared in history books as a scary story to tell children, and a cautionary tale for adults. It has been known to fell king and peasant alike, and rumors swirl that its wrath can be directed with a ritual. If this is true, a cult could gain considerable power in controlling the creature. An apocryphal tale of the executioner destroying a cult single handedly might contradict this notion. On the other hand, all knowledge of the executioner is spotty at best. What is most certain is that most of those believed to have seen the executioner are dead or mad.