Divine Shite

When hit with a Melee attack, the target must make a CON save against your spell DC or immediately empty their bowels. On a success, they feel an unpleasant rumble in their guts but take no additional damage. On a failure, they take an additional 2d8 psychic damage, plus an additional 1d8 per each spell level higher than first, to a maximum of 5d8. The damage increases by 1d8 if the creature is a mammal. This spell has no effect against constructs, elementals, and any beings without an excretory system.