War Dragon

Huge Dragon
Hit Dice: 18d8+108 (253 hp)  
Initiative: +1 (Dex)  
Speed: 40 ft; 120 ft fly.  
AC: 27 (-2 size, +1 Dex, +20 natural)  
Attacks:  +28 (primary attack bonus)  
Damage:  Bite 2d6, 2 Claws 2d6, Tail Slap 1d8
Face/Reach: 10 ft. by 20 ft./10 ft.  
Special Attacks: 
Special Qualities: Dragon Immunities, Spell Resistance 25, Blindsight 35 ft., Keen Senses
Saves: Fort +19, Ref +8, Will +10  
Abilities: Str 27, Dex 13, Con 23, Int 7, Wis 12, Cha 11  
Skills: Balance +10, Concentration +12, Escape Artist+10, Intimidate +14, Listen +14, Spot +14, Search +14, Tumble +12   
Feats: Alertness, Flyby Attack, Hover, Power Attack, Wingover 

Climate/Terrain: Arctic hills and mountains  
Organization: Solitary, patrol (2-5), or War Party (5-12)
Challenge Rating: 18  
Treasure: Standard  
Alignment: Usually Neutral 
Advancement: -  

COMBAT  
War Dragons normally only enter combat with a mounted rider.  All war dragons are specially trained to protect their rider but are fierce combatants when ordered to fight.  These dragons favor using their vicious claw attacks when fighting opponents on the ground.  They use their bite and tail slap when executing a flyby attack unless otherwise ordered by their rider.

Dragon Immunities (Ex): Immune to sleep and paralysis effects. Immune to Cold and Sonic effects.

Blindsight (Ex): A war dragon can ascertain creatures by nonvisual means (mostly hearing and scent, but also by noticing vibration and other environmental clues).

Keen Senses (Ex): A war dragon sees four times as well a human in low-light conditions and twice as well in normal light. It also has darkvision with a range of 500 ft.