Charm of Butchery

As the God of Murder's Avatar dissipated into fractures of dark shadows, you absorbed some of the savage skills of the slayer themselves. Whilst you have this charm, your footsteps leave temporary umbral marks within the ground that quickly vanish in a slight mist that smells of iron.

Once per turn when you roll damage for an attack, you can reroll any number of the damage dice rolled and use either total. Once you have used this Charm 3 times, it vanishes.