%%
```statblock
monster: Behir
```
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*Huge monstrosity, neutral evil*
**Armor Class** 17 (natural armor)
**Hit Points** 168 (16d12+64)
**Speed** 50 ft., climb 40 ft.
| STR | DEX | CON | INT | WIS | CHA |
|---------|---------|---------|--------|---------|---------|
| 23 (+6) | 16 (+3) | 18 (+4) | 7 (-2) | 14 (+2) | 12 (+1) |
**Skills** Perception +6, Stealth +7
**Damage Immunities** lightning
**Senses** darkvision 90 ft., passive Perception 16
**Languages** Draconic
**Challenge** 11 (7,200 XP)
***Multiattack***. The behir makes two attacks: one with its bite and one to constrict.
***Bite***. *Melee Weapon Attack:* +10 to hit, reach 10 ft., one target. *Hit:* 22 (3d10+6) piercing damage.
***Constrict***. *Melee Weapon Attack:* +10 to hit, reach 5 ft., one Large or smaller creature. *Hit:* 17 (2d10+6) bludgeoning damage plus 17 (2d10+6) slashing damage. 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.
***Lightning Breath (Recharge 5-6)***. The behir exhales a line of lightning that is 20 feet long and 5 feet wide. Each creature in that line must make a DC 16 Dexterity saving throw, taking 66 (12d10) lightning damage on a failed save, or half as much damage on a successful one.
***Swallow***. 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 cover against attacks and other effects outside the behir, and it takes 21 (6d6) acid 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 DC 14 Constitution 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]].