The Elder Scrolls: Tamriel

You touch a creature and siphon its life force to restore your own. The target must make a Constitution saving throw. On a failed save, the target takes 4d8 necrotic damage, and you regain hit points equal to half the necrotic damage dealt. On a successful save, the target takes half damage, and you regain no hit points. This spell has no effect on undead or constructs.