Hell Hound

Hell Hound CR: 3

Medium fiend, lawful evil

Armor Class: 15 (natural armour)

Hit Points: 45 [roll;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

Damage Immunities: Fire

Senses: Darkvision 60 ft, passive Perception 15

Languages: Understands Infernal but doesn't speak it.

Challenge Rating: 3

Keen Hearing and Smell. The hound has advantage on Wisdom (Perception) checks that rely on hearing and 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, range 5 ft, one target. Hit 7 [roll1d8+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 save.

Hell hounds, or Hellhounds, are creatures of pure evil, found in nearly all worldwide folklore. They are ominous or hellish dogs of medium to larger size, with the standard hellhound having mangled black hair & red burning eyes, and a bad temper. All are supernatural in origin. They are strong, and fast, with a foul odour and usually with other supernatural abilities. The most infamous of these in Europe is the monster hellhound Cerberus who guards the gates to Hades in Greek mythology.
Sometimes looking into the eyes of a hellhound is enough to kill a person, or even just seeing or hearing the hound yowl is enough to die, or be cursed with an omen. They meant to guard the entrances to the land of the dead, such as graveyards and burial grounds, or undertaking duties relating to the afterlife or supernatural. These can be hunting the souls of the dead, to guarding supernatural treasure.
Many different variants exist like Black Shuck or Old Shuck in parts of Britain to Cwn Annwn in Wales (the latter is classed as benign but still linked to death). Moddey Dhoo is found on the Isle of Man & Gwylig is another from Wales as well. Barghest, Bargtjest, Bo-guest, Bargest or Barguest is a form from the middle eastern part of Britain. Yeth Hound is another name in southern England, while Gytrash is another from northern England. Dip is found in the Catalan region of northern Spain.
At least a couple of these names have been linked to other such hounds by occultists and this can lead to confusion for those without the knowledge to fight them.

Suggested Environments

Graveyards, burial sites, entrances to the afterlife or underworld.