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.

From forbidden forest depths, green dragons whisper evils into the world and manipulate the lives of those who listen. Elusive, conniving, and egotistical, these chromatic dragons patiently prey on the fears of shorter-lived beings, corrupting and isolating them. Green dragons might lurk amid labyrinthine wildernesses for centuries without revealing themselves; even their most devoted followers might know them only as the voice of the woodlands or a whisper in their dreams. Despite their might, most green dragons disdain physical violence, viewing combat as servants' work and preferring to trick foes into dangerous or exploitative scenarios. These dragons collect "baubles" that embody their webs of manipulation and serve as tools of extortion, such as compromising documents, family heirlooms, and sentimental treasures.
Habitat: Forest
Treasure: Arcana
Monster Manual 2024 (BR)
  1. DnD 2024 Monsters › Ancient Green Dragon
Ancient Green Dragon