|Hit Dice:||7d12+14 (59 hp)|
|Speed:||20 ft. (4 squares), fly 60 ft. (poor)|
|Armor Class:||18 (–1 size, +1 Dex, +8 natural), touch 10, flat-footed 17|
|Attack:||Sting +10 melee (1d6+4 plus poison) or talon +10 melee (2d6+4) or bite +10 melee (2d8+4)|
|Full Attack:||Sting +10 melee (1d6+4 plus poison) and bite +8 melee (2d8+4) and 2 wings +8 melee (1d8+2) and 2 talons +8 melee (2d6+4)|
|Space/Reach:||10 ft./5 ft.|
|Special Attacks:||Poison, improved grab|
|Special Qualities:||Darkvision 60 ft., immunity to sleep and paralysis, low-light vision, scent|
|Saves:||Fort +7, Ref +6, Will +6|
|Abilities:||Str 19, Dex 12, Con 15, Int 6, Wis 12, Cha 9|
|Skills:||Hide +7, Listen +13, Move Silently +11, Spot +16|
|Feats:||Ability Focus (poison), Alertness, Flyby Attack, MultiattackB|
|Organization:||Solitary, pair, or flight (3–6)|
|Advancement:||8–10 HD (Huge); 11–21 HD (Gargantuan)|
A wyvern’s body is 15 feet long, and dark brown to gray; half that length is tail. Its wingspan is about 20 feet. A wyvern weighs about one ton.
Wyverns speak Draconic, but usually don’t bother with anything more elaborate than a loud hiss or a deep-throated growl much like that of a bull alligator.
Wyverns are rather stupid but always aggressive: They attack nearly anything that isn’t obviously more powerful than themselves. A wyvern dives from the air, snatching the opponent with its talons and stinging it to death. A wyvern can slash with its talons only when making a flyby attack.
Improved Grab (Ex): To use this ability, a wyvern must hit with its talons. It can then attempt to start a grapple as a free action without provoking an attack of opportunity. If it wins the grapple check, it establishes a hold and stings.
See Wikipedia Entry: Wyvern