From Pathfinder Adventure Path: Hell's Destiny, which isn't enabled.

Fog Hound

CREATURE 9

Variant greater hell hound

Believed to be bred by the Kings of Hell themselves within vast kennels, greater hell hounds are the favored guards and hunting hounds of powerful fiends and, rarely, mortals who worship them and have earned their favor.

Hell hounds are fiendish, extraplanar canines hailing from the Pit that can hunt down quarry and breathe supernatural gouts of flame. They are temperamental and quick to exhibit aggressive behavior.

Perception +19; darkvision, scent (imprecise) 120 feet

Languages Diabolic; (Can't Speak Any Language)

Skills Acrobatics +18, Athletics +19, Stealth +18, Survival +20 (+22 to Track)

Str +6, Dex +5, Con +5, Int -2, Wis +4, Cha -2

AC 28; Fort +21, Ref +19, Will +16

HP 150; Immunities cold; Weaknesses fire 10

Hellish Revenge

Trigger The greater hell hound is critically hit by any Strike

Effect The greater hell hound's Hellfire Breath recharges. They can immediately use it as part of this reaction.

Speed 40 feet

Melee Jaws +21 (magical, unarmed, unholy), Damage 2d8+6 piercing plus 2d6 cold

Fog Born

The fog hound's breathe fog and are composed of mist. Their jaws Strike and Hellfire Breath deal cold damage instead of fire damage and have the cold trait.

Hellfire Breath (cold, divine)

The hell hound breathes flames that deal 10d6 cold damage to all creatures in a 15-foot cone (DC 28 basic Reflex save.)

The hell hound can't use Hellfire Breath again for 1d4 rounds. If the greater hell hound would take cold damage or be targeted by a cold effect, their Hellfire Breath recharges.

Pack Attack

The greater hell hound's Strikes deal 1d8 extra damage to creatures within the reach of at least two of their allies.

Pathfinder Adventure Path: Hell's DestinyORC