Aedolzor the Shadow Idol

Aura of False Divinity. A creature that starts its turn within 30 feet of Aedolzor must make a DC 18 Wisdom saving throw, provided Aedolzor isn't incapacitated. On a failed save, the creature is charmed by Aedolzor. A creature charmed in this way can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. Once it succeeds on the saving throw, a creature is immune to Aedolzor's Aura of False Divinity for 24 hours.

Dual Minded. Aedolzor has advantage on saving throws against being blinded, deafened, stunned, and knocked unconscious.

Magic Resistance. Aedolzor has advantage on saving throws against spells and other magical effects.

Magic Weapons. At the start of each of Aedolzor's turn, he decides what happens are formed from his body or stowed. Additionally, Aedolzor's weapons count as magical for the purpose of overcoming resistances and immunities.

Shadow Sight. Magical darkness doesn't impede Aedolzor's darkvision.

Multiattack. Aedolzor makes one Celestial Flail attack and one Fiendish Blade attack. Alternatively, he uses Radiant Strike of Summon Shadows (if available) and Spellcasting.

Celestial Flail. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 16 (2d8 + 7) bludgeoning damage plus 9 (2d8) radiant damage and the target must make a DC 18 Constitution saving throw or be blinded until the start of Aedolzor's next turn. 

Claw. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 18 (2d10 + 7) slashing damage plus 11 (2d10) necrotic damage and the target must succeed on a DC 18 Constitution saving throw or have its hit point maximum reduced by an amount equal to the necrotic damage taken. This reduction lasts until the target finishes a Short or Long Rest. The target dies if this effect reduces its hit point maximum to 0.

Fiendish Blade. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 14 (2d6 + 7) piercing damage plus 14 (4d6) psychic damage and the target must make a DC 18 Wisdom saving throw or use its reaction to make a melee attack against a random target other than Aedolzor within its reach.

Radiant Strike (1/Day). Aedolzor chooses a point on the ground he can see within 60 feet of himself. A 30-foot-radius, 40-foot-high cylinder of bright light appears there until the start of Aedolzor's next turn. Each creature in the cylinder when it appears or that ends its turn there must make a DC 18 Constitution saving throw, taking 36 (8d8) radiant damage on a failed save, or half as much damage on a successful one.

Summon Shadows (1/Day). Aedolzor summons 1d4 shadows which appear in an unoccupied space within 60 feet of him and act as an ally of Aedolzor. Each shadow remains until it or Aedolzor dies. 

Spellcasting. Aedolzor casts one of the following spells, requiring no material components and using Charisma as the spellcasting ability (spell save DC 18):

At will: charm person, cure wounds, disguise self, thaumaturgy

2/day each: darkness, detect thoughts, mirror image, silence

1/day each: dominate person, insect plague, mass suggestion, raise dead

Enervating Shadows (1/Day). While in dim light or darkness, Aedolzor emanates a 10-foot aura of dim light for 1 minute. While this aura is active, Aedolzor has advantage on Dexterity (Stealth) checks, has advantage on attack rolls against creatures within the aura, and deals an extra 13 (2d12) necrotic damage on a hit.

Aedolzor can take 3 legendary actions, 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. Aedolzor regains spent legendary actions at the start of its turn.

Attack. Aedolzor makes one Claw attack.

Disappear. While in dim light or darkness, Aedolzor takes the Hide action.

Enwreathe (Costs 2 Actions). Aedolzor targets one creature he can see within 60 feet of himself. That creature must succeed on a DC 18 Dexterity saving throw or be blinded as it is enveloped in a cloud of magical darkness. until the end of Aedolzor's next turn.

Cast a Spell (Costs 3 Actions). Aedolzor uses Spellcasting.