Call of Nature

All creatures within 35 ft other than those designated by the caster must make a CON saving throw. On a failed save the  target takes 1d4 necrotic damage and is filled with an intense need to relieve their bowels and rush to do so. During this time the target is considered restrained for 1 minute and has disadvantage on all attack rolls, saving throws, and ability checks. 

On a successful save targets take 1d4 necrotic damage and relieve themselves immediately but suffer no further effects. 

Undead, Constructs, and creatures without the necessary biology to relieve their bowels are immune.