BrownSpell

On a failed Constitution saving throw, this spell assaults and twists a creature's bowels (if they possess any), causing them to fall prone and furiously defecate. They will remain prone until they can make a successful Constitution saving throw, done each turn.

An affected target will be forced into the Prone status, and all the effects that come with it.

If the target rolls a Nat20 on the initial Constitution saving throw, the effect is reversed onto the caster.