Dragon, Green Ancient (CR 20)

Gargantuan Dragon (Air)
Alignment: Always Lawful Evil
Initiative: +0; Senses: blindsense 60 ft., darkvision120 ft., low-light vision, and keen senses
Languages: Draconic

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AC: 37 (-4 size, +31 natural), touch 6, flat-footed 37
Hit Dice: 32d12+224 (432 hp); DR: DR 15/magic
Fort +25, Ref +18, Will +23

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Speed: 40 ft., fly 200 ft. (clumsy), swim 40 ft.
Space: 20 ft./15 ft. (20 ft. with bite)
Base Attack +32; Grapple +56
Attack: 1 Bite +40, 2 claws +35, 2 wings +35, 1 Tail Slap +35, 1 crush +35 melee; Breath +40 ranged
Damage: 1 bite 4d6+12, 2 claws 2d8+6, 2 wings 2d6+6, 1 tail slap 2d8+18, 1 crush 4d6+18, 1 tail sweep 2d6+18, Breath weapon 2d6 (33)
Special Attacks: Breath weapon, fear (DC 31), SR 27

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Abilities: Str 35, Dex 10, Con 25, Int 20, Wis 21, Cha 20
Special Qualities: Dominate person, Plant growth, Suggestion, Acid immunity, water breathing, CL 13
Feats: #Feats: 11
Skills: Skill Points: 352
Advancement: 33-34 HD (Gargantuan)

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Climate/Terrain: Temperate and warm forest and underground
Organization: Solitary, pair, or family (1-2 and 2-5 offspring)
Treasure: Double Standard

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Source: Monster Manual

Breath Weapon (Su): A green dragon has one type of breath weapon, a cone of corrosive (acid) gas (Reflex save for half damage DC 33) 20d6 acid damage. Using a breath weapon is a standard action. Once a dragon breathes, it can't breathe again until 1d4 rounds later. A blast from a breath weapon always starts at the dragon's mouth and extends in a direction of the dragon's choice.

Water Breathing (Ex): The dragon can breathe underwater indefinitely and can freely use its breath weapon, spells, and other abilities while submerged.