Gargantuan Monstrosity, Neutral Evil
Armor Class 21
Hit Points 460 (24d20 + 120)
Speed
STR
26 (+8)
DEX
19 (+4)
CON
21 (+5)
INT
10 (+0)
WIS
17 (+3)
CHA
15 (+2)
Damage Immunities Lightning
Senses Passive Perception 19
Languages draconic
Challenge 22 (41,000 XP)
Proficiency Bonus +7
Traits

Special Trait Name.  Senses Darkvision 90 ft.,

Actions

Multiattack. The ancient 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 ancient behir isn't already constricting a creature, and the target is restrained until this grapple ends.

Lightning Breath (Recharge 5–6). The ancient 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 ancient 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 ancient behir, and it takes 21 (6d6) acid damage at the start of each of the ancient behir's turns. A ancient behir can have only one creature swallowed at a time.

If the ancient behir takes 30 damage or more on a single turn from the swallowed creature, the ancient 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 ancient behir. If the ancient 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.

Bonus Actions

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Reactions

Reaction Name. Enter the description for your action.

Legendary Actions

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Legendary Action Name (Costs # Actions). Enter the description for your legendary action.

Mythic Actions

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Mythic Action Name (Costs # Actions). Enter the description for your mythic action.

Description

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Lair and Lair Actions

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Lair Actions

On initiative count # (losing initiative ties), the [monster name] takes a lair action to cause one of the following effects; the [monster name] can’t use the same effect two rounds in a row:

  • Enter a description for a lair action.
  • Enter a description for a lair action.

Regional Effects

The region containing a legendary [monster name]’s lair is [enter the effect description], which creates one or more of the following effects:

  • Enter a regional effect description.
  • Enter a regional effect description.

If the [monster name] dies, these effects fade over the course of #d# days.

Monster Tags: monstrosity

Habitat: Underdark

Noriaki48248

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