It is a slow painful process, rife with sleepless nights as nightmares assail the victim first. But, the miasma at the same time doesn’t effect those with a pure heart. Though those are very rare, and you can’t just say your character is pure of heart. They have to prove it through their actions.

I’m also thinking of introducing a dice system. Probably just a D6. A one being a critical fail, and a six being a complete success. That way there’s no chance to power game.