Adult Green Dragon

Huge dragon, Lawful Evil

Armor Class19 (natural armor)
Hit Points207 (18d12 + 90)
Speed40 ft., fly 80 ft., swim 40 ft.
STRDEXCONINTWISCHA
23 (+6) 12 (+1) 21 (+5) 18 (+4) 15 (+2) 17 (+3)
Saving ThrowsCha +8, Con +10, Dex +6, Wis +7
SkillsDeception +8, Insight +7, Perception +12, Persuasion +8, Stealth +6
Damage Vulnerabilities—
Damage Resistances—
Damage Immunitiespoison
Condition Immunitiespoisoned
Sensesblindsight 60 ft., darkvision 120 ft., passive Perception 22
LanguagesCommon, Draconic
Challenge15

Traits

Amphibious.

The dragon can breathe air and water.

Legendary Resistance (3/Day).

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 Attack Roll: +11 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage plus 7 (2d6) poison damage.

Claw.

Melee Attack Roll: +11 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing damage.

Tail.

Melee Attack Roll: +11 to hit, reach 15 ft., one target. Hit: 15 (2d8 + 6) 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 16 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 (Recharge 5-6).

The dragon exhales poisonous gas in a 60-foot cone. Each creature in that area must make a DC 18 Constitution saving throw, taking 56 (16d6) poison damage on a failed save, or half as much damage on a successful one.

Legendary Actions

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 10 feet of the dragon must succeed on a DC 19 Dexterity saving throw or take 13 (2d6 + 6) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.