Dragon, Obsidian Young Adult (CR 12)

Large Dragon (Fire)
Alignment: Always neutral evil
Initiative: +0; Senses: blindsense 60 ft., darkvision120 ft., low-light vision, and keen senses
Languages: Draconic

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AC: 27 (-1 size, +18 natural), touch 9, flat-footed 27
Hit Dice: 19d12+76 (199 hp); DR: 5/magic
Fort +15, Ref +11, Will +12

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Speed: 40 ft., fly 150 ft. (poor), burrow 20 ft., swim 20 ft.
Space: 10 ft./5 ft. (10 ft. with bite)
Base Attack +19; Grapple +29
Attack: 1 bite +24, 2 claws +19, 2 wings +19, 1 tail slap +19
Damage: 1 bite 2d6+6, 2 claws 1d8+3, 2 wings 1d6, 1 tail slap 1d8
Special Attacks/Actions: Breath weapon 10d10 (23)

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Abilities: Str 23, Dex 10, Con 19, Int 23, Wis 13, Cha 12
Special Qualities: Fire subtype, planar travel, Firefall, Biofeedback, burning ray, SR 22, Fear aura (DC 20), Manifester level 5
Feats: #Feats: 7
Skills: Skill points: 120
Advancement: 20-21 HD (Huge)

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Climate/Terrain: Inner Planes, warm mountains, underground
Organization: Solitary (1 dragon, any age), clutch (1d4+1 wyrmlings, very young, young, juvenile, or young adults), family (pair of mature adults and 1d4+1 offspring)
Treasure/Possessions: Double standard

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Source: Web

Fire Subtype (Ex): An obsidian dragon is immune to fire but takes double damage from cold, except on a successful save.

Breath Weapon (Su): An obsidian dragon has one breath weapon: a cone of fire.

Planar Travel (Su): Obsidian dragons have the innate ability to pass instantly between the Material Plane and the Inner Planes, where they often make their homes.

Psionics (Sp): 3/day -- biofeedback, burning ray, ectoplasmic armor, firefall, flaming shroud, plane shift, wall of ectoplasm, whitefire; 1/day -- genesis, mind store. Manifester level varies by age; save DC d20 + appropriate ability modifier + power level.

Attack/Defense Modes: mind thrust/thought shield. An obsidian dragon manifests powers and gains additional attack and defense modes as if it were a psion with Metacreativity as its primary discipline.

Skills: An obsidian dragon has the Appraise skill for free at 1 rank per Hit Die.

Fire Subtype

A creature with the fire subtype has immunity to fire. It has vulnerability to cold, which means it takes half again as much (+50%) damage as normal from cold, regardless of whether a saving throw is allowed, or if the save is a success or failure.