Dragon, Green Wyrm (CR 21)
AC: 40 (-4 size, +34 natural), touch 6, flat-footed 40
Hit Dice: 35d12+280 (507 hp); DR: 20/magic
Fort +27, Ref +19, Will +24
Speed: 40 ft., fly 200 ft. (clumsy), swim 40 ft.
Space: 20 ft./15 ft. (20 ft. with bite)
Base Attack +35; Grapple +60
Attack: 1 Bite +44, 2 claws +39, 2 wings +39, 1 Tail Slap +39, 1 crush +39, 1 Tail sweep +39 melee; Breath +44 ranged
Damage: 1 bite 4d6+13, 2 claws 2d8+6, 2 wings 2d6+6, 1 tail slap 2d8+19, 1 crush 4d6+19, 1 tail sweep 2d6+19, Breath weapon 2d6 (35)
Special Attacks/Actions: Breath weapon, fear (DC 32), SR 28
Abilities: Str 37, Dex 10, Con 27, Int 20, Wis 21, Cha 20
Special Qualities: Plant growth, Suggestion, Acid immunity, water breathing, CL 15
Feats: #Feats: 12
Skills: Skill Points: 385
Advancement: 36-37 HD (Gargantuan)
Climate/Terrain: Temperate and warm forest and underground
Organization: Solitary, pair, or family (1-2 and 2-5 offspring)
Treasure/Possessions: Double Standard
Breath Weapon (Su): A green dragon has one type of breath weapon, a cone of corrosive (acid) gas (Reflex save for half damage DC 35) 22d6 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.
This subtype usually is used for elementals and outsiders with a connection to the Elemental Plane Air. Air creatures always have fly speeds and usually have perfect maneuverability (see the section on Movement).