Nether Hound Ghast* (CR 4)

Medium Undead
Alignment: Always chaotic evil
Initiative: +7; Senses: darkvision 60 ft., low-light vision, scent, Listen +9, and Spot +15

AC: 21 (+5 Dex, +6 natural), touch 15, flat-footed 16
Hit Dice: 4d12+3 (29 hp)
Fort +1, Ref +6, Will +7
Speed: 40 ft., climb 20 ft.
Space: 5 ft./5 ft.
Base Attack +2; Grapple +7
Attack: Bite +7 melee
Full Attack: Bite +7 melee and 2 claws +5 melee
Damage: Bite 1d8+5 plus paralysis and diseases, claws 1d4+2 plus paralysis and disease
Special Attacks/Actions: Demon fever, ghoul fever, paralysis, stench, sure striking, yowling
Abilities: Str 21, Dex 21, Con -, Int 11, Wis 1, Cha 16 (Ego: 18)
Special Qualities: Acid and fire resistance 5, cold immunity, electricity and sonic resistance 10, +2 turn resistance, undead
Feats: Improved Initiative; Multiattack; Run; Toughness; Track
Skills: Balance +9, Climb +19, Hide +10, Jump +11, Listen +9, Move Silently +10, Search +6, Spot +15, and Survival +9
Advancement: 5-8 HD (Medium)
Climate/Terrain: Any
Organization: Solitary, team (2-3), pack (4-12), or hunt (13-30 nether hounds).
Treasure: Standard

Source: Dragon #322

A gaunt creature hunches bestially before you, its filth-stained gray flesh stretched taut over protruding bones. Its features might have once been humanoid, but now it is a thing of savagery and decay, its hollow eyes and snarling mouth weeping a viscous black gore.

This example uses a ghast as the base creature.

Nether hound ghasts are commonly pack leaders of hunts of lesser nether hounds. Already being disgusting and profane creatures, the transformation that makes them into nether hounds only deepens their already considerable depravity.

This is a sample creature derived from a Template.