Hell Hound

Medium Fiend, Lawful Evil

AC: 15

Initiative: +1 (11)

HP: 45 (7d8 + 14)

Speed: 50 ft.

STR
17 (+3)
DEX
12 (+1)
CON
14 (+2)
INT
6 (-2)
WIS
13 (+1)
CHA
6 (-2)

Skills: Perception +5

Immunities: fire

Senses: darkvision 60 ft., Passive Perception 15

Languages: understands Infernal but can't speak it

CR: 3 (XP 700; PB +2)

Habitat: Underdark, Mountain

Keen Hearing and Smell.

The hound has advantage on Wisdom (Perception) checks that rely on hearing or smell.

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 isn't incapacitated.

Actions

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.

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Hell Hound

Source: Monster Manual (2014), p. 182 - Licenses and attribution