Devouring One
Large Aberration (Zerg)

Hit Dice: 9d8+45 (85 hp)
Initiative: +6 (+2 Dex, +4 Improved Initiative)
Speed: 50 ft., burrow 10 ft.
Armour Class: 17 (+2 Dex, -1 size, +6 natural), touch 11, flat-footed 15
Base Attack/Grapple: +6/+15
Attack: Claw +11 melee (2d6+5/18-20/x3)
Full Attack: 2 claws +11 melee (2d6+5/18-20/x3) and bite +5 melee (2d6+2)
Space/Reach: 10 ft./5 ft.
Special Attacks: Rake (2d10+5).
Special Qualities: Darkvision 60 ft., fast healing 5, immunity to poison and cold, resistance to acid and eletricity 15, Zerg traits.
Saves: Fort +8, Ref +5, Will +7
Abilities: Str 21, Dex 14, Con 20 Int 1, Wis 13, Cha 7
Skills: Hide +2 (+6 underground), Listen +1 (+5 underground)
Feats: Improved Initiative, Improved Natural Attack (claw), Run, Weapon Focus (claw)
Environment:
Any
Organization: Solitary, pair, or pack (6-15)
Challenge Rating: 6
Treasure: None
Alignment: Lawful evil
Advancement: --
Level Adjustment: --

   This creature looks like a zergling, though it is noticibly larger and more feral than usual.

Description

   A more deadly strain of Zergling, the Devouring Ones are larger and more powerful. Their name arose after Terran witnesses saw some of them stop in the middle of battle to eat their fallen foes - regardless of whether they were dead or alive.

Combat
   Like their lesser Zergling brethen, the Devouring Ones are vicious and tenacious combatants, lunging and tearing at their foes with their razor-sharp claws.
   Augmented Critical (Ex): Due to its sickle-bladed forelegs, a Devouring One's claw attack threatens a critical hit on a natural attack roll of 18–20, dealing triple damage on a successful critical hit.
   Rake (Ex): If a Devouring One begins its turn grappling with a foe, it may make two claw attacks at a +4 bonus. These attacks deals 2d6+1 points of damage.
   Skills: Devouring Ones have a +4 racial bonus to listen and hide checks while underground.