Fists of Light

On a successful melee hit, curse the target with a curse of healing. Any hit on this creature heal the opponent with 1D2.

This works for you and your team mates. But some strong enemies seems to be immune. (Red bosses.)

The Fist deal 4D6 additional positive damage on undead and there is a chance that a hit on an undead creature with the curse of healing deals additional 1D50 positive damage on a vorpal strike. (Natural 20 followed by critical confirmation.)