vampiric surge

You draw upon the life force of creatures around you, siphoning their blood to empower yourself. Each creature within 30 feet of you (allies included) must make a Constitution saving throw equal to your spell DC. On a failure, a target takes 5d6 necrotic damage, and you regain hit points equal to half the total damage dealt. On a success, a target takes half damage and you regain no hit points.