Behir

The serpentine behir crawls along floors and clambers up walls to reach its prey. Its lightning breath can incinerate most creatures, even as more powerful foes are constricted in its coils and eaten alive. A behir's monstrous form resembles a combination of centipede and crocodile. Its scaled hide ranges from ultramarine to deep blue, fading to pale blue on its underside.
Cavern Predators Behirs lair in places inaccessible to other creatures, favouring locations where would-be intruders must make a harrowing climb to reach them. Deep pits, high caves in cliff walls, and caverns reached only by narrow, twisting tunnels are prime sites for a behir ambush. A behir's dozen legs allow it to scramble through its lair site with ease. When not climbing, it moves even faster by folding its legs beside its body and slithering like a snake. Behirs swallow their prey whole, after which they enter a period of dormancy while they digest. While dormant, a behir chooses a hiding place where intruders in its lair might overlook it.
Foes of the Dragons In times long forgotten, giants and dragons engaged in seemingly endless war. Storm giants created the first behirs as weapons against the dragons, and behirs retain a natural hatred for dragon kind. A behir never makes its lair in an area it knows to be inhabited by a dragon. If a dragon attempts to establish a lair within a few dozen miles of a behir's lair, the behir is compelled to kill the dragon or drive it off. Only if the dragon proves too powerful to fight does a behir back down, seeking out a new lair site a great distance away.

Behir

The serpentine behir crawls along floors and clambers up walls to reach its prey. Its lightning breath can incinerate most creatures, even as more powerful foes are constricted in its coils and eaten alive. A behir's monstrous form resembles a combination of centipede and crocodile. Its scaled hide ranges from ultramarine to deep blue in color, fading to pale blue on its underside.

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Armor Class	17 (natural armor)
Hit Points	16d12+64
Speed	50 ft.	Climb 40 ft.
Strength	23 (+6)
Dexterity	16 (+3)
Constitution	18 (+4)
Intelligence	7 (-2)
Wisdom	14 (+2)
Charisma	12 (+1)
Skills	Perception d20+6	Stealth d20+7
Damage Immunities	Lightning
Senses	Darkvision 90 ft.	Passive Perception 16
Languages	Draconic
Challenge	11 (7,200 XP)
Action 1	Multiattack	The behir makes two attacks:	one with its bite and one to constrict
Action 2	Bite	Melee Weapon Attack	d20+10 to hit
Reach 10 ft., one target	Hit 3d10+6 piercing damage
Action 3	Constrict	Melee Weapon Attack	d20+10 to hit
Reach 5 ft., one Large or smaller creature	Hit 2d10+6 bludgeoning damage	plus 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
Action 3	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 12d10 lightning damage on a failed save,	or half as much damage on a successful one
Action 4	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 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