Dragon, Crystal Wyrm (CR 21)

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

AC: 40 (-4 size, +34 natural), touch 6, flat-footed 40
Hit Dice: 37d12+296 (507 hp); DR: 20/magic
Fort +27, Ref +19, Will +24
Speed: 40 ft., fly 200 ft. (clumsy), burrow 5 ft., swim 40 ft.
Space: 20 ft./15 ft. (20 ft. with bite)
Base Attack +37; Grapple +62
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 22d6 (35)
Special Attacks/Actions: Breath Weapon 22d6 (35); fear (DC 32), SR 28
Abilities: Str 37, Dex 10, Con 27, Int 20, Wis 21, Cha 21
Special Qualities: Cold immunity, planar travel, charm person, Color spray, Domination
Feats: #Feats: 13
Skills: Skill points: 191
Advancement: 36-37 HD (Gargantuan)
Climate/Terrain: Inner Planes, temperate and cold mountains
Organization: Solitary, pair, or family (1-2 and 2-5 offspring)
Treasure/Possessions: Double Standard

Source: Monster Manual II

Breath Weapon (Su): A crystal dragon's breath weapon is a cone of brilliant light. A target who fails his or her Reflex saving throw (DC 35) takes 22d6 damage and is blinded for 1d4 rounds. 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.

Bite: The dragon also can use its bite snatch opponents. Bite attacks use the full attack bonus.

Claw: The dragon also can use its claws to snatch opponents. Claw attacks are at -5 to the attack bonus.

Wing: The dragon can slam opponents with its wings, even when flying. Wing attacks are at -5 to the attack bonus.

Tail Slap: The dragon can slap one opponent each round with its tail. A tail slap is at -5 to the attack bonus.

Crush: A flying or jumping dragon of at least Huge size can land on opponents as a standard action, using its whole body to crush them. Crush attacks are effective only against opponents three or more sizes smaller than the dragon (though it can attempt normal overrun or grapple attacks against larger opponents). A crush attack affects as many creatures as can fit under the dragon's body. Creatures in the affected area must succeed at a Reflex save against a DC 35 or be pinned, automatically taking bludgeoning damage during the next round unless the dragon moves off them. If the dragon chooses to maintain the pin, treat it as a normal grapple attack. Pinned opponents take crush damage each round if they don't escape.

Tail Sweep: A dragon of Gargantuan size can sweep with its tail as a standard action. The sweep affects a half circle with a diameter of 30 feet, centered on the dragon's rear. Creatures within the swept area are affected if they are four or more sizes smaller than the dragon. Creatures can attempt Reflex saves to take half damage against a DC 35.

Frightful Presence (Ex): A wyrm dragon can unsettle foes with its mere presence. The ability takes effect automatically whenever the dragon attacks, charges, or flies overhead. Creatures within a radius of 330 feet are subject to the effect if they have fewer HD than the dragon (35 HD).

Air Subtype

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).