Armor Class 15
Hit Points 58 (9d8 + 18)
Speed 50 ft.
Skills Perception +5
Damage Immunities fire
Senses Darkvision 60 ft., passive Perception 15
Languages understands Infernal but can't speak
Challenge 3
Pack Tactics. The hound has Advantage on an attack roll against a creature if at least one of the hound's allies is within 5 feet of the creature and the ally doesn't have the Incapacitated condition.
Multiattack. The hound makes two Bite attacks.
Bite. m +5, reach 5 ft. Hit: 7 (1d8 + 3) Piercing damage plus 3 (1d6) Fire damage.
Fire Breath (Recharge 5–6). dex DC 12, each creature in a 15-foot Cone. 17 (5d6) Fire damage. Half damage.
Monster Manual (2024), p. 165