Bonesting (CR 1)

Medium Undead
Alignment: Always neutral
Initiative: +7 (+3 Dex, +4 Improved Initiative)

AC: 15 (+3 Dex, +2 natural), touch 13, flat-footed 12
Hit Dice: 2d12 (13 hp)
Fort -, Ref +3, Will +3
Speed: 0 ft.
Space: 5 ft. by 5 ft./5 ft.
Base Attack +6; Grapple +
Attack: Swordspike +6 melee
Damage: Swordspike 2d6+7
Special Attacks/Actions: Swordspike, wounding
Abilities: Str 20, Dex 16, Con -, Int -, Wis 10, Cha 11
Special Qualities: Immunities, undead traits
Feats: Improved Initiative
Skills: -
Advancement: 3-4 HD (Large); 5-6 HD (Huge)
Climate/Terrain: Any land and underground
Organization: Any
Treasure: None

Source: Web

Bone monsters are undead creatures assembled from the bones of fallen creatures and knitted together with necromantic magic. They are mindless automatons that obey the orders of their evil masters. If destroyed, they collapse into piles of unconnected bones.

These undead creatures appear as great snakelike assemblies of bone that are fixed to the wall, ceiling, or floor at one end. They have a length of 8 to 16 feet when fully uncoiled, and they have a thickness of about 1 foot.

A bonesting can be created by means of an animate dead spell, and it requires two corpses to create one bonesting.