Ancient Green Dragon

Gargantuan / dragon / Lawful Evil / CR 22

Armor Class21
Hit Points402 (23d20 + 161)
Speed40 ft, fly 80 ft, swim 40 ft
Challenge22
Proficiency-
STR27+8
DEX12+1
CON25+7
INT20+5
WIS17+3
CHA22+6
Senses

Blindsight 60 ft, Darkvision 120 ft

Languages

Common, Draconic

Damage immunities

Poison

Condition immunities

Poisoned

Traits

Amphibious

The monster can breathe air and water.

Legendary Resistance

Special

If the monster fails a saving throw, it can choose to succeed instead.

Actions

Multiattack

Action

The monster makes three attacks. It can replace one attack with a use of Spellcasting to cast (level 5 version).

Rend

Action

. .

Poison Breath

Action

Constitution Saving Throw: DC , each creature in a -foot .
Failure: damage.
Success: Half damage.

Spellcasting

Action

The monster casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC ):
At Will: Detect Magic, Mind Spike (level 5 version)
1/Day Each: Geas, Modify Memory

Prepared Spells

Mind Spike, Detect Magic, Mind Spike, Geas, Modify Memory

Referenced spells