Mel'dorath, Bane of Vannoth and Elvenkind

Mel'dorath, Bane of Vannoth and Elvenkind
Medium Fiend, chaotic evil
Armor Class: 18 (natural armor)
Hit Points: 195 (17d8+119)
Speed: 40 ft. fly 40

STR: 24 (+7)
DEX: 16 (+3)
CON: 24 (+7)
INT: 16 (+3)
WIS: 16 (+3)
CHA: 22 (+6)

Skills: Athletics +12, Intimidation +12
Damage Resistances: fire, poison; bludgeoning, piercing, and slashing from nonmagical weapons
Condition Immunities: poisoned
Senses: darkvision 120 ft., passive Perception 13
Languages: Abyssal, Common, Elvish, Infernal
Challenge Rating: 10 (5,900 XP)

Actions:

Multiattack: Mel'dorath can make three attacks: one with his halberd, one with his claws, and one with his tail.

Halberd: Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 18 (2d10+7) slashing damage.

Claws: Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 12 (2d6+7) slashing damage plus 10 (3d6) fire damage.

Tail: Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 16 (2d8+7) bludgeoning damage.

Fire Breath (Recharge 5-6): Mel'dorath exhales fire in a 30-foot cone. Each creature in that area must make a DC 18 Dexterity saving throw, taking 42 (12d6) fire damage on a failed save, or half as much damage on a successful one.

Unholy Artifact: Blood of the Vannoth Children. Mel'dorath carries a vial of the blood of Vannoth children, which he can use as a bonus action to heal himself for 30 hit points.

Anti-Elf Aura: Mel'dorath radiates an aura of malice towards elves. Elves within 30 feet of him have disadvantage on all attack rolls and saving throws.

Innate Spellcasting: Mel'dorath's innate spellcasting ability is Charisma (spell save DC 18). He can innately cast the following spells, requiring no material components:

At will: darkness, detect magic, detect thoughts, dispel magic, fireball, levitate
2/day each: dimension door, fly, wall of fire

Legendary Actions:

Mel'dorath can take 3 legendary actions per round, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Mel'dorath regains spent legendary actions at the start of its turn.

Attack: Mel'dorath makes one attack with his halberd, claws, or tail.

Flame Burst (Costs 2 Actions): Mel'dorath unleashes a burst of flames in a 20-foot radius around him. Each creature in that area must make a DC 18 Dexterity saving throw, taking 21 (6d6) fire damage on a failed save, or half as much damage on a successful one.

Vanish (Costs 2 Actions): Mel'dorath magically teleports up to 60 feet to an unoccupied space he can see.