Behir

The Behir makes one Bite attack against a Medium or smaller target it is grappling. If the attack hits, the target is also swallowed, and the grapple ends. While swallowed, the target is blinded and restrained, it has total against attacks and other effects outside the Behir, and it takes damage at the start of each of the Behir's turns. A Behir can have only one creature swallowed at a time. If the Behir takes 30 damage or more on a single turn from the swallowed creature, the Behir must succeed on a saving throw at the end of that turn or regurgitate the creature, which falls prone in a space within 10 feet of the Behir. If the Behir dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 15 feet of movement, exiting prone.

The behir makes two attacks: one with its bite and one to constrict.

+10 to hit, range 10 ft. Hit: 22 (3d10 + 6) piercing damage.

+10 to hit, range 5 ft. Hit: 17 (2d10 + 6) bludgeoning damage. Melee Weapon Attack: , reach 5 ft., one Large or smaller creature. The target is grappled (escape DC 16) if the Behir isn't already constricting a creature, and the target is restrained until this grapple ends.

The behir exhales a of lightning. Each creature in that line must make a saving throw, taking damage on a failed save, or half as much damage on a successful one.