Greater Hell HoundCreature 9
Source Pathfinder Monster Core
Perception +19 (darkvision, scent (imprecise) 120 feet)
Languages Diabolic, (can't Speak Any Language)
Skills Acrobatics +18, Athletics +19, Stealth +18, Survival +20
Str +6, Dex +5, Con +5, Int -2, Wis +4, Cha -2
AC 28; Fort +21; Reflex +19; Will +16;
HP 150
Speed 40 feet
Immunities fire
Weaknesses Cold 10
Jaws
+21 (+16, +11) to hit (magical, unarmed, unholy) 2d6 Fire + 2d8+6 PiercingHellish 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.
Hellfire Breath
(divine, fire)The hell hound breathes flames that deal 10d6 fire damage to all creatures in a 15-foot cone (DC 28 reflex save.)
The hell hound can't use Hellfire Breath again for 1d4 rounds. If the greater hell hound would take fire damage or be targeted by a fire effect, their Hellfire Breath recharges.
Pack AttackThe greater hell hound's Strikes deal 1d8 extra damage to creatures within the reach of at least two of their allies.
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.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
BeastA creature similar to an animal but with an Intelligence modifier of –3 or higher is usually a beast. Unlike an animal, a beast might be able to speak and reason.
FiendCreatures that hail from or have a strong connection to the unholy planes are called fiends. Fiends can survive the basic environmental effects of planes in the Outer Sphere.
FireEffects with the fire trait deal fire damage, or either conjure or manipulate fire. Those that manipulate fire have no effect in an area without fire. Creatures with this trait consist primarily of fire or have a connection to magical fire.
UnholyEffects with the unholy trait are tied to powerful magical forces of cruelty and sin. They often have stronger effects on holy creatures. Creatures with this trait are strongly devoted to unholy causes, and often have weakness to holy. If a creature with weakness to unholy uses an unholy item or effect, it takes damage from its weakness.