Need some help with a build idea…

Basically I wanna do a holy or pure/unholy or impure build. It’s not really based on stats, more like aesthetic. The idea is to have one weapon that represents sanctity, and another that represents something evil or disgusting. Bonus points if they can both be powerstanced. Some spells would be nice too, maybe miracles and hexes, but I’m not sure if splitting stats like that would be a good idea though. This would be a NG+ build btw.