Waterboarding

You have learned how to create water inside a creatures lungs, filling them until the creature nearly suffocates. 

When you touch a creature to create water in their lungs, the creature must succeed on a constitution saving throw or take 4d8 bludgeoning damage and be stunned until the start of the creatures turn. Upon the start of the creatures turn, it uses it's reaction to cough up the water.

 At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d8 for each slot level above 4th.