Schadenfreude Weapon

Schadenfreude (any weapon): Whenever one of your allies (not you though) fumbles an attack roll and you hit the same target as the ally has attacked with this weapon in your next turn the hit becomes a critical hit instead. Usually rolling a natural 1 counts as a fumble,  but being targeted with thiefling's Curse of Chaos also counts. Quirk: Mocks aloud another's misfortune.