Zombie Wyvern (CR 4)

Large Undead
Alignment: Always neutral
Initiative: +0; Senses: darkvision 60 ft.

AC: 20 (-2 size, +12 natural), touch 8, flat-footed 20
Hit Dice: 14d12+3 (94 hp); DR: 5/slashing
Fort +4, Ref +4, Will +9
Speed: 20 ft., cannot run, fly 60 ft. (poor)
Space: 10 ft./5 ft.
Base Attack +7; Grapple +16
Attack: Slam +11 melee or talons +11 melee
Full Attack: Slam +11 melee or talons +11 melee
Damage: Slam 2d6+7, talon 2d6+5
Special Attacks/Actions:
Abilities: Str 21, Dex 10, Con -, Int -, Wis 10, Cha 1
Special Qualities: single actions only, undead traits
Feats: Toughness
Advancement: 16-20 HD (Huge)
Climate/Terrain: Warm hills
Organization: Any
Treasure/Possessions: None

Source: Monster Manual

Zombies are corpses reanimated through dark and sinister magic. These mindless automatons shamble about, doing their creator's bidding without fear or hesitation.

Zombies are not pleasant to look upon. Drawn from their graves, half decayed and partially consumed by worms, they wear the tattered remains of their burial clothes. A rank odor of death hangs heavy in the air around them.

Because of their litter lack of intelligence, the instructions given to a newly created zombie must be very simple, such as "Kill anyone who enters this room."