Turdwave

A wave of excrementous force sweeps out from you. Each creature in a 15-foot cube originating from you must make a Constitution saving throw. On a failed save, a creature takes 2d8 poison (shit) damage and is covered in shit, which reduces its movement speed by 15 ft. On a successful save, the creature takes half as much damage and does not suffer the movement penalty.

In addition, unsecured objects that are completely within the area of effect are automatically covered in shit, making it difficult terrain until the end of your turn, and the spell emits a farterous boom audible out to 300 feet.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 for each slot level above 1st.