17 (natural armor)
84 (16d12+64)
walk 50 ft., climb 40 ft.
Perception +4, Stealth +5
lightning
darkvision 90 ft.
Draconic
6
The behir makes two attacks: one with its bite and one to constrict.
Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 22 (3d10 + 6) piercing damage.
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 14 Dexterity saving throw, taking 66 (12d10) lightning damage on a failed save, or half as much damage on a successful one.
The monstrosity can take 0 legendary action, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The monstrosity regains spent legendary action at the start of its turn.