monster

Parasite-infested Behir

CR 11

Huge Undead, Neutral Evil

Reveal Stat Block

Armor Class

17 (natural armor)

Hit Points

168 (16d12 + 64)

Speed

50 ft., climb 40 ft.

str

dex

con

int

-2

wis

cha

Actions

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

Bite.mw 10 to hit, reach 10 ft., one target. ({@damage 3d10 + 6) piercing damage.

Constrict.mw 10 to hit, reach 5 ft., one Large or smaller creature. ({@damage 2d10 + 6) bludgeoning damage plus 17 (2d10 + 6) slashing damage. The target is grappled (escape 16) if the behir isn't already constricting a creature, and the target is restrained until this grapple ends.

Lightning Breath 5.The behir exhales a line of lightning that is 20 feet long and 5 feet wide. Each creature in that line must make a 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 Cover||3||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. Any creature swallowed by a parasite-infested behir must succeed on a 19 Constitution saving throw at the start of each of the behir's turns or be feasted upon by blood parasites, taking 36 (8d8) necrotic damage on a failed save, or half as much damage on a successful save. This damage is in addition to the damage caused by the behir's digestive acids. If the behir takes 30 damage or more on a single turn from the swallowed creature, the behir must succeed on a 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.

Parasite-infested Behir

When a parasite-infested behir roars or discharges their lightning breath, thousands of gray, parasitic blood worms can be seen writhing inside their mouths. Targeting the behir with magic that removes a disease kills off its blood parasites.