The party rescues a demon from captivity. In “gratitude”, he enchants one of their weapons (by impaling one of his imps on it, then using the imp’s lifeforce to power the enchantment). The weapon now slowly drips blood when drawn, and has a move associated with it.
I’m trying to decide on what the move should be – I want it to be something double-edged, to reflect the questionable source of the enchantment. Some ideas:
When you draw blood with this blade, deal +1 damage, but take 1 damage in return (ignoring armor).
When you let this blade taste your blood, hold 1. When you deal damage with it, you can choose to spend your hold to deal +1d6 damage but take 1d4 damage (ignoring armor) in return.