Skeleton, Large (Chimera) (CR 4)

Large Undead
Alignment: Always neutral evil
Initiative: +6 (+2 Dex, +4 Improved Initiative); Senses: darkvision 60 ft.

AC: 13 (-1 size, +2 Dex, +2 natural), touch 11, flat-footed 11
Hit Dice: 9d12 (58 hp); DR: 5/bludgeoning
Fort +0, Ref +1, Will +3
Speed: 30 ft.
Space: 10 ft./5 ft.
Base Attack +4; Grapple +12
Attack: Bite +7 melee
Full Attack: Bite +7 melee and bite +7 melee and gore +7 melee and 2 claws +2 melee
Damage: Bite 2d6+4, bite 1d8+4, gore 1d8+4, Claw 1d6+2
Special Attacks/Actions:
Abilities: Str 14, Dex 12, Con -, Int -, Wis 10, Cha 11
Special Qualities: cold immunity, Undead
Feats: Improved Initiative
Advancement: -
Climate/Terrain: Any land and underground
Organization: Any
Treasure/Possessions: None

Source: Monster Manual

Skeletons are the animated bones of the dead, mindless automatons that obey the orders of their evil masters.

A skeleton does only what it is ordered to do. It can draw no conclusions of its own and takes no initiative. Because of this limitation, its instructions must always be simple, such as "Kill anyone who enters this chamber."

A skeleton attacks until it is destroyed, for that is what it was created to do. The threat posed by a skeleton depends primarily on its size.