Evacuation-

A creature that you can see within range must make a Charisma saving throw. 

Whenever a target fails this saving throw roll a d20, on a roll of 1-10  it projectile vomits or 11-20 it has explosive diarrhea. 

The target must make a saving throw each round- if the save is failed it takes another roll on the d20 and must endure the results. 

While projectile vomiting or experiencing explosive diarrhea the target loses its action and is at disadvantage for all saving throws, as well as causing any social ramifications from their "evacuation."