You can redeem your foes instead of slaying them. When an enemy you can see is reduced to 0 Hit Points, you can take a Reaction to protect the creature from further harm. Instead of dropping to 0 Hit Points, the creature drops to 1 Hit Point and has the Unconscious condition. The condition ends early for it if it regains any Hit Points. When the creature awakens, any magical effect causing it to be Charmed, cursed, Frightened, or possessed ends. Furthermore, the creature becomes Friendly to you and your Allies.
Once you use this feature, you can't use it again until you finish a Long Rest.