Cell Burst

Out of your hand comes a black spectral dagger that targets one creature you can see that is solid. The creature must succeed on a dc 15 Con. saving throw or take 18 force damage as its cells become separated, this causes a one inch in diameter whole to appear in that creature, and on the start of there turns, they take 1d4 acid damage until they are healed or they die. If they succeed on the saving throw, the creature takes 9 piercing damage.