Bone Lurker (CR 2)

Large Undead
Alignment: Always neutral
Initiative: +4

AC: 12 (-1 size, +0 Dex, +3 natural), touch 9, flat-footed 12
Hit Dice: 3d12 (19 hp)
Fort +1, Ref +1, Will +3
Speed: 20 ft., fly 30 ft. (poor)
Space: 5 ft. by 10 ft./5 ft.
Base Attack + ; Grapple +
Attack: slam +5 melee
Damage: Slam 1d8+7
Special Attacks/Actions: Constrict 1d8+7, improved grab, paralysis
Abilities: Str 20, Dex 10, Con -, Int -, Wis 10, Cha 11
Special Qualities: Immunities, undead traits
Feats: Improved Initiative
Skills: -
Advancement: 4 HD (Large); 5-9 HD (Huge)
Climate/Terrain: Any land and underground
Organization: Any
Treasure/Possessions: None

Source: Web

Constrict (Ex): A bone lurker deals 1d8+7 points of damage with a successful grapple check.

Improved Grab (Ex): If the bone lurker hits an opponent that is at least one size category smaller than itself with its slam attack, it deals normal damage and attempts to start a grapple as a free action without provoking an attack of opportunity (grapple bonus +10). The bone lurker has the option to conduct the grapple normally, or simply use its body to hold the opponent. Either way, each successful grapple check it makes during successive rounds automatically deals slam damage and constrict damage.

Paralysis (Ex): Any creature hit by a bone lurker's slam attack must succeed at a Fortitude save (DC 11) or be paralyzed for 1d6+2 minutes.

Immunities (Ex): Bone lurkers have cold immunity. Because they lack flesh or internal organs, they take only half damage from piercing or slashing weapons.

Skills: A bone lurker gains skills as a construct.

A bone lurker attacks by dropping onto its prey and wrapping itself around its victim. Dropping down in this fashion is considered a charge attack from higher ground. A bone lurker that misses its initial attack often flies up and tries to drop on the opponent again.

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 portcullises or gridwork-curtains created from interlaced human and beast bones adorned with sharp bone spurs.

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