Void Hound, Seeker (CR 3)

Medium Magical Beast (Extraplanar and Void)
Alignment: Always neutral evil
Initiative: +6 (+2 Dex, +4 Improved Initiative); Senses: darkvision 120 ft. and low-light vision


AC: 16 (+2 Dex, +4 natural), touch 12, flat-footed 14
Hit Dice: 3d10+9 (25 hp)
Fort +6, Ref +5, Will +1
Speed: 60 ft.
Space: 5 ft./5 ft.
Base Attack +3; Grapple +7
Attack: Bite +7 melee or slice charge +7 melee
Full Attack: Bite +7 melee plus 2 claw +2 melee or slice charge +7
Damage: Bite 1d10+4, claw 1d6+2, slice charge 1d8+6 plus wounding
Special Attacks: Slice charge, wounding
Abilities: Str 18, Dex 14, Con 16, Int 4, Wis 10, Cha 6
Special Qualities: evasion, immunity to energy drain, void subtype
Feats: Improved Initiative; Power Attack
Skills: Hide +13 and Move Silently +5
Advancement: 4-9 HD (medium-sized)
Climate/Terrain: Any
Organization: Solitary or pack (1d8)
Treasure/Possessions: None

Source: Web

The gray, six-legged canine snarls through its large muzzle. The hairless monster has rows of razorlike bone protruding along its spine.

Void walkers created the void hounds as companions and killing machines. They are six-legged hairless dogs with whiplike tails. Coloration ranges from dull gray to black, and most have black or red eyes. They possess viscous fangs and their front pair of legs has claws similar to those of a bear. Their most dangerous feature, however, is their backbone: Each vertebra has a razorlike protrusions jutting out through the hide. These sharp bones are strong as steel and cause devastating wounds as the hound rushes by. As the hounds grow older, they increase in size.

Void hounds are completely loyal and obedient to their masters. They will kill quickly or toy with a target, depending on the cruelty of the walker commanding them.

Combat

As beings of the Void, the hounds share many of the same special traits as their masters.

Immunity to Energy Drain (Ex): Due to their physical makeup, energy drains of any type (level drain, temporary or permanent ability damage, etc.) cannot effect void hounds.

Slice Charge (Ex): A seeker can use its razor-sharp spine as a weapon; to do so, it must charge. The seeker throws its whole body into attack and gains 1-1/2 times its Strength bonus on damage, just as if using a sole natural weapon.

Wounding (Ex): A hit from the seeker's slice charge deals 1 point of Constitution damage from blood loss when it hits a creature. A critical hit does not multiply the Constitution damage. Creatures immune to critical hits (such as plants and constructs) are immune to the Constitution damage dealt by the slice charge.

Skills: A void hound has a +8 racial bonus on Hide checks.