Gray Render (CR 8)

Large Magical Beast
Alignment: Usually neutral
Initiative: +0; Senses: darkvision 60 ft., low-light vision, and Spot +10

AC: 19 (-1 size, +10 natural), touch 9, flat-footed 19
Hit Dice: 10d10+70 (125 hp)
Fort +14, Ref +7, Will +4
Speed: 30 ft.
Space: 10 ft./10 ft.
Base Attack +10; Grapple +20
Attack: Bite +15 melee
Full Attack: Bite +15 melee, 2 claws +10 melee
Damage: Bite 2d6+6, claw 1d6+3
Special Attacks/Actions: Improved grab, rend 3d6+9
Abilities: Str 23, Dex 10, Con 24, Int 3, Wis 12, Cha 8
Special Qualities:
Feats: Cleave; Power Attack; Improved Bull Rush; Track
Skills: Hide +2, Spot +10, and Survival +3
Advancement: 11-15 HD (Large); 16-30 HD (Huge)
Climate/Terrain: Any land and underground
Organization: Solitary
Treasure/Possessions: None

Source: Monster Manual

Improved Grab (Ex): To use this ability, the gray render must hit with its bite attack.

Rend (Ex): A gray render that gets a hold latches onto the opponent's body and tears the flesh. This attack automatically deals 3d6+9 points of damage.

Skills: Gray renders receive a +4 racial bonus to Spot checks due to their six keen eyes.

A gray render attacks to kill whether to bring down prey or to protect itself or those it has adopted. When hunting, it sometimes attempts to hide and wait for prey to wander close.