Encounters by Locale: Storm Horns and Thunder Peaks - Low Hills
Wyvern (CR 6)
Alignment: Usually neutral
Initiative: +1 (Dex); Senses: darkvision 60 ft., low-light vision, scent, Listen +13, and Spot +16
Languages: May speak Draconic
AC: 20 (-1 size, +1 Dex, +8 natural), touch 10, flat-footed 17
Hit Dice: 7d12+14 (59 hp)
Fort +7, Ref +6, Will +6
Speed: 20 ft., fly 60 ft. (poor)
Space: 10 ft./5 ft.
Base Attack +7; Grapple +15
Attack: Sting +10 melee or talon +10 melee or bite +10 melee
Full Attack: Sting +10 melee and bite +8 melee and 2 wings +8 melee and 2 talons +8 melee
Damage: Sting 1d6+4 and poison, bite 2d8+2, wing 1d8+2; talon 2d6+4
Special Attacks: Poison, improved grab
Abilities: Str 19, Dex 12, Con 15, Int 6, Wis 12, Cha 9
Special Qualities: immunity to sleep and paralysis
Feats: Alertness; Flyby Attack; Multiattack
Skills: Hide +7, Listen +13, Move Silently +11, and Spot +16
Advancement: 8-10 HD (Huge); 11-21 HD (Gargantuan)
Climate/Terrain: Warm hills
Organization: Solitary, pair or flight (3-6)
Source: Monster Manual
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 claws and stinging it death.
A wyvern can slash with its claws only when making a flyby attack, and it cannot make bite, sting, or wing attacks.
Poison (Ex): Sting, Fortitude save (DC 17); initial and secondary damage 2d6 temporary Constitution.
Improved Grab (Ex): To use this ability, the wyvern must hit with both claw attacks. If it gets a hold, it hangs on and stings.
Snatch: If a wyvern gets a hold on a creature four or more sizes smaller, it automatically deals damage with both claws and its sting attacks each round the hold is maintained.
The wyvern can drop a creature it has snatched as a free action or use a standard action to fling it aside. A flung creature travels 30 feet and takes 3d6 points of damage. If the wyvern flings it while flying, the creature suffers this amount or falling damage, whichever is greater.
Skills: Wyverns receive a +3 racial bonus to Spot checks when flying during daylight hours.