The vallowex makes one spiked tongue attack against a Medium or smaller target it is grappling. If the attack hits, the target is also swallowed, and the grapple ends. The swallowed target is blinded and restrained, it has total cover against attacks and other effects outside the vallowex, and it takes 10 (3d6) acid damage at the start of each of the vallowex's turns. The vallowex can have only one creature swallowed at a time. If the vallowex takes 15 damage or more on a single turn from the swallowed creature, the vallowex must succeed on a DC 15 Constitution saving throw at the end of that turn or regurgitate the creature, which falls prone in a space within 5 feet of the vallowex. If the vallowex dies, the swallowed creature is no longer restrained by it and can escape from the corpse using 10 feet of movement, exiting prone.