Amphibious
The dragon can breathe air and water.
Ancient Green Dragon
Gargantuan Dragon · Lawful Evil
Armor Class21
Hit Points402 (23d20 + 161)
SpeedWalk 40 ft., Fly 80 ft., Swim 40 ft.
Challenge22
STR27
DEX12
CON25
INT20
WIS17
CHA22
Traits
Legendary Resistance (4/Day, or 5/Day in Lair)
If the dragon fails a saving throw, it can choose to succeed instead.
Actions
Multiattack
The dragon makes three Rend attacks. It can replace one attack with a use of Spellcasting to cast (level 5 version).
Rend
Melee Attack +15, reach 15 ft. 17 () 🗡️ Slashing damage plus 10 () ☠️ Poison damage.
Poison Breath Recharge 5
CON Save DC 22, each creature in a 90-foot Cone [Area Of Effect].
Failure: 77 () ☠️ Poison damage.
Success: Half damage.
Failure: 77 () ☠️ Poison damage.
Success: Half damage.
Legendary Actions
Mind Invasion
The dragon uses Spellcasting to cast (level 5 version).
Noxious Miasma
CON Save DC 21, each creature in a 30-foot-radius Sphere [Area Of Effect] centered on a point the dragon can see within 90 feet.
Failure: 17 () ☠️ Poison damage, and the target takes a -2 penalty to AC until the end of its next turn.
Success or Failure: The dragon can't take this action again until the start of its next turn.
Failure: 17 () ☠️ Poison damage, and the target takes a -2 penalty to AC until the end of its next turn.
Success or Failure: The dragon can't take this action again until the start of its next turn.
Pounce
The dragon moves up to half its Speed, and it makes one Rend attack.