{{monster,frame
## Ancient Green Dragon
*Gargantuan Dragon, Lawful Evil*
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**Armor Class** :: 21 (natural)
**Hit Points** :: 385 (22d20 + 154)
**Speed** :: 40 ft., fly 80 ft., swim 40 ft.
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|STR|DEX|CON|INT|WIS|CHA|
|:---:|:---:|:---:|:---:|:---:|:---:|
|27 (+8)|12 (+1)|25 (+7)|20 (+5)|17 (+3)|19 (+4)|
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**Skills** :: Deception +11, Insight +10, Perception +17, Persuasion +11, Stealth +8
**Damage Immunities** :: Poison
**Condition Immunities** :: Poisoned
**Senses** :: blindsight 60 ft., darkvision 120 ft., passive perception 27, passive Perception 27
**Languages** :: Common, Draconic
**Challenge** :: 22 (41,000 XP)
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***Amphibious.*** The dragon can breathe air and water.

***Legendary Resistance.*** If the dragon fails a saving throw, it can choose to succeed instead.
### Actions
***Multiattack.*** The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

***Bite.*** Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 19 (2d10 + 8) piercing damage plus 10 (3d6) poison damage.

***Claw.*** Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 22 (4d6 + 8) slashing damage.

***Tail.*** Melee Weapon Attack: +15 to hit, reach 20 ft., one target. Hit: 17 (2d8 + 8) bludgeoning damage.

***Frightful Presence.*** Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 19 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.

***Poison Breath.*** The dragon exhales poisonous gas in a 90-foot cone. Each creature in that area must make a DC 22 Constitution saving throw, taking 77 (22d6) poison damage on a failed save, or half as much damage on a successful one.
### Legendary Actions
Ancient Green Dragon can take 3 Legendary Actions, choosing from the options below. Only one Legendary Action option can be used at a time, and only at the end of another creature's turn. Ancient Green Dragon regains spent Legendary Actions at the start of its turn.

***Detect.*** The dragon makes a Wisdom (Perception) check.

***Tail Attack.*** The dragon makes a tail attack.

***Wing Attack (Costs 2 Actions).*** The dragon beats its wings. Each creature within 15 ft. of the dragon must succeed on a DC 23 Dexterity saving throw or take 15 (2d6 + 8) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.
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