Barghest

Large fiend (shapechanger), neutral evil
Armor Class 17 (natural armor)
Hit Points 90 (12d10 + 24)
Speed 60 ft. (30 ft. in goblin form)
STR
19 (+4)
DEX
15 (+2)
CON
14 (+2)
INT
13 (+1)
WIS
12 (+1)
CHA
14 (+2)
Skills Deception +4, Intimidation +4, Perception +5, Stealth +4
Damage Resistances cold, fire, lightning; bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities acid, poison
Condition Immunities poisoned
Senses blindsight 60 ft., darkvision 60 ft., passive Perception 15
Languages Abyssal, Common, Goblin, Infernal, telepathy 60 ft.
Challenge 4 (1100 XP)

Shapechanger. The barghest can use its action to polymorph into a Small goblin or back into its true form. Other than its size and speed, its statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. The barghest reverts to its true form if it dies.

Fire Banishment. When the barghest starts its turn engulfed in flames that are at least 10 feet high or wide, it must succeed on a DC 15 Charisma saving throw or be instantly banished to Gehenna. Instantaneous bursts of flame (such as a red dragon's breath or a fireball spell) don't have this effect on the barghest.

Keen Smelt. The barghest has advantage on Wisdom (Perception) checks that rely on smell.

Innate Spellcasting. The barghest's innate spellcasting ability is Charisma (spell save DC 12). The barghest can innately cast the following spells, requiring no material components:

At will: levitate, minor illusion, pass without trace
1/day each: charm person, dimension door, suggestion
ACTIONS

Bite. Melee Weapon Attack (true form only): +6 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) piercing damage.

Claws. Melee Weapon Attack. +6 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) slashing damage.

Volo´s Guide to Monsters
Barghest