Vengeance

You utter a word of vengeance against your attackers. They feel the pain of their attacks against you as if you had attacked them yourself.

When you take damage from an attack, you can use a reaction to cause your attacker to feel some of the pain you felt from their attack. You still take full damage, but your attacker also takes half the damage from the attack as necrotic damage.

When cast at 7th level or higher, the damage is increased from half the damage dealt to full damage.