Banderhobb from Volo's Guide to Monsters

Swallow. The banderhobb makes a bite attack against a Medium or smaller creature it is grappling. If the attack hits, the target is swallowed, and the grapple ends. The swallowed creature is blinded and restrained, it has total cover against attacks and other effects outside the banderhobb and it takes 10  (3d6) necrotic damage at the start of each of the banderhobb’s turns. A creature reduced to 0 hit points in this way stops taking necrotic damage and becomes stable.

Banderhobb from Volo's Guide to Monsters (page 122)

Swallow. The banderhobb makes a bite attack against a Medium or smaller creature it is grappling. If the attack hits, the creature is swallowed, and the grapple ends. The swallowed creature is blinded and restrained, it has total cover against at- tacks and other effects outside the banderhobb, and it takes 10  (3d6) necrotic damage at the start of each of the banderhobb's turns. A creature reduced to O hit points in this way stops taking the necrotic damage and becomes stable. The banderhobb can have only one creature swallowed at a time. While the banderhobb isn't incapacitated, it can regurgitate the creature at any time {no action required) in a space within 5 feet of it. The creature exits prone. If the banderhobb dies, it likewise regurgitates a swallowed creature.