Blood Boil

This spell attempts to wrench the blood from a foe's body.

Choose 1 creature you can see within range. That creature must succeed on a constitution saving throw or take 1d4 poison damage and be poisoned until the end of your next turn or until the spell ends. Creatures without blood are immune to this spell. 

At 5th level, the spell deals 2d4 poison damage. At 11th level it deals 3d4. At 17th it deals 4d4.