Bite

Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 27 (4d10 + 5) piercing damage, and a Medium or smaller target must succeed on a DC 15 Strength saving throw or be swallowed whole. A swallowed creature is blinded and restrained and has total cover against attacks and other effects outside the nightgarm. It takes 21 (6d6) acid damage at the start of each of the nightgarm's turns. A nightgarm can have only one creature swallowed at a time. If the nightgarm takes 25 damage or more on a single turn from the swallowed creature, the nightgarm must succeed on a DC 14 Constitution saving throw at the end of that turn or regurgitate the creature, which falls prone within 5 feet of the nightgarm. If the nightgarm dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 10 feet of movement, exiting prone.