Blood Curse

You curse the blood within your foe. Choose a creature that you can see within range. If the target has blood, it must succeed on a Constitution saving throw or be restrained for the duration.

At the end of each of its turns, the target can make another Constitution saving throw. On a success, the spell ends on the target. On a failure, the target takes 1d12 necrotic damage, and you regain hit points equal to half the amount of necrotic damage dealt.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d12 for each slot level above 2nd.