5e SRD:Hell Hound
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Medium fiend, lawful evil
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) piercing damage plus 7 (2d6) fire damage.
Fire Breath (Recharge 5-6). The hound exhales fire in a 15-foot cone. Each creature in that area must make a DC 12 Dexterity saving throw, taking 21 (6d6) fire damage on a failed save, or half as much damage on a successful one.
Monstrous, fire-breathing fiends that take the form of powerful dogs, hell hounds are found on the battlefields of Acheron and throughout the Lower Planes. On the Material Plane, hell hounds are most commonly seen in service to devils, fire giants, and other evil creatures that use them as guard animals and companions.
Burning Hunger. Hell hounds hunt in packs, feeding on any creature that appears edible. They avoid potentially dangerous foes in favor of targeting the weakest prey with their savage bite and fiery breath, demonstrating a relentless determination as they pursue that prey to the bitter end.
Evil to the Core. Hell hounds are smarter than mundane beasts, and their lawful nature makes them good at following orders. However, a hell hound's evil disposition means that the creature can't be trained to be anything other than a ruthless killer. If a hell hound isn't allowed to indulge its malevolent hunger, it quickly abandons or turns against its master.