Wall of poo

You summon a great mound of poo on your foes. The mound is a 15 by 15 by 15 cube of solidified waste. If you are somehow trapped under here, my unlucky enemy, you have to make a dc20 strength, a dc20 con, and a dc20 dex saving throw or else you take 1000 hit points of force damage and instantly die and all your stuff gets destroyed.