Hook Horror
Large Beast
Hit Dice: 5d10+15 (42 hp)
Initiative: +1 (+1 Dex)
Speed: 20 ft., climb 20 ft.
AC: 17 (–1 size, +1 Dex, +7 natural)
Attacks: 2 claws +8 melee, bite +3 melee
Damage: Claw 1d8+5, bite 1d10+5
Face/Reach: 5 ft. by 10 ft./5 ft.
Special Attacks: Automatic bite
Special Qualities: Low light vision, darkvision 60 ft.
Saves: Fort +7, Ref +5, Will +2
Abilities: Str 20, Dex 13, Con 17, Int 7, Wis 13, Cha 12
Skills: Listen +10*, Spot +8*, Climb +15*
Feats: None
Climate/Terrain: Any land and underground
Organization: Solitary, pack (2-12), clan (2-30)
Challenge Rating: 3
Treasure: None
Alignment: Usually neutral
Advancement: 6-8 HD (Large); 9-15 HD (Huge)

The hook horror stands about nine feet tall and weighs almost 350 pounds. It has a tough, mottled grey exoskeleton, like that of an insect. Its front limbs end in 12-inch-long hooks. Its legs end in feet that have three small hooks, like long, sharp toes. Its head is shaped like that of a vulture, including the hooked beak. Its eyes are multifaceted. It is thought that the hook horror is distantly related to the cockroach or cave cricket.

Combat
     Automatic bite (Ex):  Hook horrors attack with both hooks.  If on any round both hit, during that round their beaks hit automatically, plus and additional 1d4+5 for each hook attached, and the character is considered grappled.  They automatically inflict damage 1d10+5 each round with their beaks until at least one of the hooks is dislodged.  A hook is dislodged by a successful opposed grapple check.
     Blindsight (Ex):  Hook horrors have acute hearing and can detect approaching enemies and track by sound (DC 10).  They can detect opponents within 30 feet, underground this increases to 60 feet.  A silence spell negates this and forces the hook horror to rely on its weak vision, which has a maximum range of 20 feet.  
     Poor vision (Ex): Hook horrors have very poor eyesight, and are blinded in normal light.  They suffer no penalties if blinded or in complete darkness.  They attack silenced opponents with the penalties others suffer when attacking blind.
     Skills:  Hook horrors have acute hearing and receive a +2 racial bonus to Listen, Spot and Climbing checks. Hook horrors are natural climbers, as their hooks give them excellent purchase on rock surfaces. They can move at normal speed up vertical surfaces that are not sheer. Their great weight means that they cannot hang from the ceiling like other insects.  The Listen and Spot bonuses are lost if the Blindsight is negated.