When a flumph strikes an opponent with its spikes, it injects a burning, irritating acid that deals 1d6 acid damage immediately and another, equal, amount of acid damage on the round after the attack. The target can end the acid's effects by submerging the wound in water for a round or by being treated with a Heal check. A creature that grapples or swallows the flumph takes this acid damage automatically every round it maintains this contact with a living flumph.