Blood Boil

You attempt to disturb the blood of one creature you can see within range. The target must succeed on a Constitution saving throw or take 1d4 necrotic damage and be poisoned until the end of your next turn or the spell ends. While it is poisoned by this spell, it has disadvantage on saving throws
to maintain concentration and its speed is reduced by half.
Creatures without blood are immune to this spell. At 5th level, the spell deals 2d4 necrotic damage. At 11th
level it deals 3d4, and at 17th level it deals 4d4.