Dexterity +8, Wisdom +10
Deception +13, Perception +17, Persuasion +13, Stealth +8
+15
Blindsight 60 ft, Darkvision 120 ft
Common, Draconic
Poison
Poisoned
Traits
Amphibious
The ancient green dragon can breathe air and water.
Legendary Resistance
4/day (5/day in lair). If the ancient green dragon fails a saving throw, it can choose to succeed instead.
Actions
Multiattack
The ancient green dragon makes three Rend attacks. It can replace one attack with a use of Spellcasting to cast Mind Spike (level 5 version).
Rend
Melee Weapon Attack: +15 to hit, reach 5 ft.. Hit: 17 (2d8 + 8) slashing plus 10 (3d6) poison damage.
Poison Breath
Recharge 6. Constitution Saving Throw: DC 22, each creature in a 15-foot Cone.
Failure: 77 (22d6) poison damage.
Success: Half damage.
Spellcasting
1 use per day. The ancient green dragon casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 21):
At Will: Detect Magic, Mind Spike (level 5 version)
1/Day Each: Geas, Modify Memory
Legendary Actions
3 legendary actions (4 in its lair). Only one legendary action can be used at a time and only at the end of another creature's turn. This creature regains spent legendary actions at the start of its turn.
Mind Invasion
The dragon uses Spellcasting to cast Mind Spike (level 3 version).
Noxious Miasma
Constitution Saving Throw: DC 21, each creature in a 30-foot-radius Sphere centered on a point the ancient green dragon can see within 90 feet.
Failure: 17 (5d6) poison damage, and the target takes a −2 penalty to AC until the end of its next turn.
Failure or Success: The ancient green dragon can't take this action again until the start of its next turn.
Pounce
The ancient green dragon moves up to half its Speed, and it makes one Rend attack.
Prepared Spells
Mind Spike, Detect Magic, Mind Spike, Geas, Modify Memory
Creature Rules
Green Dragons
Ancient Green Dragon
Green Dragon Lairs