Blood Boil

This spell attempts to wrench the blood in a foe's body. Choose one creature you can see within range. That creature must make a Constitution Saving Throw. On a failure, it takes 1d4 poison damage and is poisoned until the end of your next turn or until the spell ends. While poisoned in this way, it has disadvantage on Attack rolls and Ability Checks.

Creatures without blood are immune to this spell. At 5th level, the spell deals 2d4 poison damage. At 11th level it deals 3d4, and at 17th it deals 4d4