Aurora, The Void King

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

Multiattack. Aurora can makes two Claw attacks.

Claw. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 11 (1d8+7) slashing damage.

Void Cannon (Recharge 5–6). Aurora turns his right arm into a cannon, then releases necrotic energy in a giant orb. A 20-foot radius of magical darkness appears here. Each creature within the area of a 20-feet radius must make a DC 20 Dexterity saving throw. On a failed save, the creature takes  46 (15d6) necrotic damage, and is blinded until the start of Aurora's next turn. On a successful save, the creature takes half as much damage, and isn't blinded.

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

1/day each: Eyebite, Vampiric Touch (level 6), Circle of Death, Shadow Blade (level 6), Wither and Bloom (level 6), Abi-Dalzim's Horrid Wilting

2/day each: Dispel Magic

3/day each: Counterspell

Shadow Step. Aurora magically teleports to an unoccupied space it can see within 60 feet of it.

Pull (Recharge 5–6). Aurora uses the power of the void to attempt to pull a target towards him. Target 1 creature 17 Str save or be pulled 30ft towards the creature.

The void king 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. The dragon regains spent legendary actions at the start of its turn.

Weapon Attack. Aurora makes one attack.

Use Spell (Costs 2 Actions). Aurora uses one spell.

Void Gaze (Costs 2 Actions). Aurora shoots a wave of void energy from his right arm cannon in a burst. 30ft cone DC 17 Wis save or be restrained until the end of its next turn.

Abyssal Voice (Costs 3 Actions). Aurora speaks in abyssal attempting to gain the influence of those who can hear. 60ft centered on caster - DC 17 Wis save or charmed until end of their turn.