Ancient Green Dragon

Gargantuan Dragon (Chromatic), Lawful Evil
Initiative +15 (25)
AC 21
HP 402 (23d20 + 161)
Speed 40 ft., Fly 80 ft., Swim 40 ft.
MOD
SAVE
MOD
SAVE
MOD
SAVE

Str
27
+8
+8
Dex
12
+1
+8
Con
25
+7
+7

Int
20
+5
+5
Wis
17
+3
+10
Cha
22
+6
+6

Skills Deception +13, Perception +17, Persuasion +13, Stealth +8
Immunities Poison; Poisoned
Senses Blindsight 60 ft., Darkvision 120 ft., Passive Perception 27
Languages Common, Draconic
CR 22 (XP 41 000, or 50 000 in lair; PB +7)
Traits

Amphibious. The dragon can breathe air and water.

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 Mind Spike (level 5 version).

Rend. Melee Attack Roll: +15, reach 15 ft. Hit: 17 (2d8 + 8) Slashing damage plus 10 (3d6) Poison damage.

Poison Breath (Recharge 5–6). Constitution Saving Throw: DC 22, each creature in a 90-foot Cone. Failure: 77 (22d6) Poison damage. Success: Half damage.

Spellcasting. The 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
Legendary Action Uses: 3 (4 in Lair). Immediately after another creature's turn, The dragon can expend a use to take one of the following actions. The dragon regains all expended uses at the start of each of its turns.

Mind Invasion. The dragon uses Spellcasting to cast Mind Spike (level 5 version).

Noxious Miasma. Constitution Saving Throw: DC 21, each creature in a 30-foot-radius Sphere centered on a point the 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 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.

Ancient green dragons are creatures of legend, rarely seen by their servants or foes. Via magic and well-hidden agents, these dragons stoke suspicion between allies and undermine noble works. As bonds fray, the dragons reap rewards of greater wealth and control. Eventually the ambitions of ancient green dragons stretch beyond their territories as they seek control over empires, planar realms, or death itself.
Habitat: Forest
Treasure: Arcana
Monster Manual 2024
  1. DnD 2024 Monsters › Ancient Green Dragon