Blood Boil

You attempt to disturb the blood of a 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, the target has disadvantage on saving throws to maintain concentration and its speed is reduced by half. 

Creatures without blood are immune to this spell. 

This spell's damage increases to 2d4 at 5th level, 3d4 at 11th level, and 4d4 at 17th level.