Tidal Push

Upon casting, ripples of energy vibrate across the surrounding water in a 15-foot sphere originating from you. Any creature in that range must make a Constitution saving throw. On a failed save, a creature takes 2d8 force damage and is pushed 10 feet away from you. On a successful save, the creature takes half damage and isn't pushed. 

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.

This spell can only be used underwater.