Blood Boil

You make a clawed hand at a creature you see within range, causing its blood to boil. The creature must make a constitution saving throw, or take 4d6 necrotic damage, 4d6 fire damage, and be poisoned for the duration of the spell. While it is poisoned this way, it takes 2d6  necrotic damage and 2d6 fire damage on the start of each of its turns. If it succeeds on its saving throw, it takes half damage and is not poisoned.