So I had an idea for a class that would definitely fit the darker side of a story. 

A reaper. 

Main weapon would be a scythe with blood magic slashes and aoe based combos

The sub would be a soul lantern which would add maybe necromancer based abilities like resurrection of enemies and having them fight for you for a set time.

I'd say preferably female or maybe not gender locked and being slightly undead looking probably.

The armor would be maybe hooded robe based with a semi skull. 

The run animation could be more of a floating animation for the ethereal and ghostly like effect with a black fog.

I think this class would definitely fit they type to side with the black spirit so this type of class could be like sided with it but this is just an idea I had.

(Think I posted this in off topic on another site lol)