Barbas

Daedric Armor. While wearing his armor, any critical hit against him becomes a normal hit. Whenever he takes piercing or slashing damage the armor reduces the damage by 6 (to a minimum of 0).

Liar. When he makes a Charisma check, he can treat any roll of 9 or lower on the die as if he rolled a 10. Additionally, no matter what he says, magic that would determine if he is telling the truth indicates that he is being truthful.

Evasion. When Barbas is subjected to an effect that allows him to make a Dexterity saving throw to take only half damage, he instead takes no damage if he succeeds on the saving throw and only half damage if he fails. He can’t use this feature if he has the Incapacitated condition.

Legendary Resistance (3/Day). If Barbas fails a saving throw, he can choose to succeed instead.

Multiattack. Barbas makes two searing shortsword attacks and uses his spellcasting to cast one of his at-will spells.

Searing Shortsword. Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 20 (3d6 + 9) piercing damage plus 11 (3d6) fire damage. At the start of each of its turns until the spell ends, the target takes 11 (3d6) Fire damage and then makes a DC 22 Constitution saving throw. On a failed save, the spell continues. On a successful save, the spell ends. Attacks with this weapon critically hit on rolls of 18-20. Whenever this weapon hits an object, the hit is a critical hit.

Spellcasting. Barbas casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 24, +16 to hit with spell attacks):
At Will: Shapechange (no Temporary Hit Points gained from the spell, and no Concentration or Temporary Hit Points required to maintain the spell), Plane Shift, Teleport, Creation (level 6 version), Charm Monster (level 6 version), Major Image, Detect Magic, Chromatic Orb (level 3 version), Fireball
3/Day Each: Dominate Monster, Chain Lightning, Fire Storm, Heal, Dispel Magic (level 5 version)
1/Day Each: Meteor Swarm, Weird, Mirage Arcane, Mass Suggestion

Misty Step. Barbas casts Misty Step, using the same spellcasting ability as Spellcasting.

Hellish Rebuke (3/Day). Barbas casts Hellish Rebuke (level 5 version) in response to the spell’s trigger, using the same spellcasting ability as Spellcasting.