mmmm I wouldn't go so far as an Oxymoron given the context because well Heavenly is a state of mind Satanic people may consider hell to be heaven right? And more to the point Heavenly could also be used as a describition similiar to saying a beautiful reaper and thats not including the term Reaper in itself... more of an oxymoron you would be looking for would be something like Life giving Death giver Sorry I'll shut up now