Call of Nature

A creature of your choice that you can see within range has aggressive diarrhea and becomes poisoned for one minute, if this spell affects it. The target must succeed on a Constitution saving throw or fall prone, becoming incapacitated and unable to stand up for the duration. 

At the end of each of its turns, and each time it takes damage, the target can make another Constitution saving throw. On a success, the target is no longer incapacitated.

Undead and Constructs are not affected. 

At Higher Levels. When you cast this spell using a spell slot of 4nd level or higher, you can target one additional creature for each slot level above 3rd.