Climate/Terrain: Inner Planes, warm mountains, underground
Organization: Wyrmling, very young, young, juvenile, and young adult: solitary or clutch (2-5); adult, mature adult, old, or very old: solitary, pair, or family (1-2 plus 2-5 offspring); ancient, wyrm, or great wyrm: solitary.
Challenge Rating: Wyrmling 3; very young 4; young 6; juvenile 9; young adult 12; adult 14; mature adult 17; old 19; very old 20; ancient 22; wyrm 23; great wyrm 25.
Treasure: Double standard
Alignment: Always neutral evil.
Advancement: Wyrmling 8-9 HD (Small); very young 11-12 HD (Medium-size); young 14-15 HD (Medium-size); juvenile 17-18 HD (Large); young adult 20-21 HD (Large); adult 23-24 HD (Huge); mature adult 26-27 HD (Huge); old 29-30 HD (Huge); very old 32-33 HD (Huge); ancient 35-36 HD (Gargantuan); wyrm 38-39 HD (Gargantuan); great wyrm 41+ HD (Gargantuan).
Obsidian dragons, while the most intelligent of the gem dragons, are also the most vicious. They are extremely haughty, anger easily, and like to toy with prey before finishing it off.
An obsidian dragon has smooth black skin with razor edges where joints come together. When first hatched, their scales are gray, rough to touch, and well defined. As they get older, the scales darken, become smoother, and begin to blend together.
Most obsidian dragons prefer to make their lairs around volcanoes or in one of the mountains of coal found on the Elemental Plane of Fire. Most great wyrms, though, make use of the genesis power to create their own demiplane.
Obsidian dragons do not shy away from combat, but they make quick assessments of the opposition and determine within a couple of rounds whether they can overpower their foes easily. If not, they retreat to formulate an ambush or to avoid very powerful foes.
They prefer to use their breath weapons and long-range tactics to soften up prey before using their physical attacks to finish them. A favorite finishing tactic of theirs is to snatch an opponent and plane shift to the Elemental Plane of Fire or to their demiplane if the environment is hostile enough.
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.
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