Dragon, Green Very Old (CR 18)
AC: 36 (-2 size, +28 natural), touch 8, flat-footed 36
Hit Dice: 29d12+174 (362 hp); DR: 15/magic
Fort +22, Ref +16, Will +20
Speed: 40 ft., fly 150 ft. (poor), swim 40 ft.
Space: 15 ft./10 ft. (15 ft. with bite)
Base Attack +29; Grapple +48
Attack: 1 Bite +38, 2 claws +33, 2 wings +33, 1 Tail Slap +33, 1 crush +33 melee; Breath +38 ranged
Damage: 1 bite 2d8+11, 2 claws 2d6+5, 2 wings 1d8+5, 1 tail slap 2d6+16, 1 crush 2d8+16, Breath weapon 2d6 (30)
Special Attacks/Actions: Breath weapon, fear (DC 28), SR 25
Abilities: Str 33, Dex 10, Con 23, Int 18, Wis 19, Cha 18
Special Qualities: Plant growth, Suggestion, Acid immunity, water breathing, CL 11
Feats: #Feats: 10
Skills: Skill Points: 290
Advancement: 30-31 HD (Huge)
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 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.
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).