Bilge Sphincter

 is a mutation that can only be granted to the player character by consuming the Cloaca Surprise.

A will take up the tail slot of the creature, or the feet if there are somehow no tail slots.

The has a 15% chance to strike when bump-attacking an enemy; striking with the bilge sphincter in turn has a 25% chance of poisoning the attacked creature with a toughness save of 20, with a damage increment of  and a duration of  turns.