Dragon, Green Old (CR 17)

Huge 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: 33 (-2 size, +25 natural), touch 8, flat-footed 33
Hit Dice: 26d12+156 (325 hp); DR: DR 10/magic
Fort +21, Ref +15, Will +19

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Speed: 40 ft., fly 150 ft. (poor), swim 40 ft.
Space: 15 ft./10 ft. (15 ft. with bite)
Base Attack +26; Grapple +44
Attack: 1 Bite +34, 2 claws +29, 2 wings +29, 1 Tail Slap +29, 1 crush +29 melee; Breath +34 ranged
Damage: 1 bite 2d8+10, 2 claws 2d6+5, 2 wings 1d8+5, 1 tail slap 2d6+15, 1 crush 2d8+15, Breath weapon 2d6 (29)
Special Attacks: Breath weapon, fear (DC 27), SR 24

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Abilities: Str 31, Dex 10, Con 23, Int 18, Wis 19, Cha 18
Special Qualities: Plant growth, Suggestion, Acid immunity, water breathing, CL 9
Feats: #Feats: 9
Skills: Skill Points: 260
Advancement: 27-28 HD (Huge)

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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 26) 14d6 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.