Converting Red Hand of Doom to 5e

[Draz74]

Barghest Reavers

Spoiler: Barghest

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Large Fiend (shapechanger)
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Armor Class 17
HP 90
Speed 60 ft
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Str +4, Dex +2, Con +2
Int +1, Wis +1, Cha +2
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Skills Deception +4, Intimidation +4, Perception +5, Stealth +4
Resistances cold, fire, lightning; bludgeoning/piercing/slashing from nonmagical attacks
Immunities acid, poison; poisoned
Senses blindsight 60 ft, darkvision 60 ft
Languages Infernal, Goblin, Worg, Common
CR 4 (1100 XP)
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Shapechanger. The barghest can use its action to polymorph into a Small goblin or back into its true form. In goblin form, its Speed is reduced to 30 ft, and it cannot use its bite attack. Otherwise, its statistics (other than size) 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 Smell. 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
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Actions
Bite (melee) +6: 2d8+4 piercing
Claws (melee) +6: 1d8+4 slashing

Spoiler: Hobgoblin Regular

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Medium Humanoid (goblinoid)
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Armor Class 18 (chain mail, shield)
HP 11
Speed 30 ft
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Str +1, Dex +1, Con +1
Int +0, Wis +0, Cha -1
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Senses darkvision 60 ft
Languages Goblin, Common
CR 1/2 (100 XP)
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Martial Advantage. Once per turn, the hobgoblin can deal an extra 2d6 damage to a creature it hits with a weapon attack if that creature is within 5 feet of an ally of the hobgoblin that isn't incapacitated.
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Actions
Longsword (melee) +3: 1d8+1 slashing, or 1d10+1 slashing if wielded in two hands.
Longbow (ranged 150/600 ft) +3: 1d8+1 piercing

Encounter Composition
Barghest *3
Hobgoblin Regular *6

XP Award: 3900

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The barghest is minimally altered from its stat block in Volo's, partly so that I'm not posting copyrighted material unchanged.