Visceral Burst

A small cluster of blades bursts forth from the abdomen of a creature you can see within range. Make a ranged spell attack against any creature you can see within range. On a hit, the target takes 3d6 piercing damage and an additional 1d4 piercing damage on a subsequent turn.

At Higher Levels.  When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for each slot level above 3rd.