Ardashian (Ardyn) Scourge of The Thirteen

Immortal Regeneration. At the start of Ardyn's turn he regains 4d12+10 hit points, he does not regain them if he take radiant damage or is hit with one of the Royal Arms. 

Spellcasting. Ardyn is a 30th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 20, +12 to hit with spell attacks). Ardyn has following spells prepared:
Spells (at will): Counterspell, Feather Fall, Find Fimiliar, Hold Person, Greater Invisibility, Silence, Fear, Tongues, Alter Self, Dominate Person, Modify Memory, Scrying, Telepathy, Slow, Ray of Enfeeblement, Bane, Bestow Curse, Dimension Door, Ego Whip, Locate Creature, Creation, Dream, Seeming
9th level (9 slots): Earthquake, Illusory Dragon, Feeblemind, Meteor Swarm, Time Ravage, Time Stop, Psychic Scream, Wish, Foresight (Self Only),

Multi Attack. Ardyn Makes 4 Royal Blade Attacks or 4 Arminger Weapon Attacks

Rakshasa Blade. Melee Weapon Attack: +12 to hit, reach 5 ft., 1 target. Hit:  (2d10 + 7) [Slashing] damage. 

Spectral Scythe. Melee Weapon Attack: +16 to hit, reach 15 ft., 1 target. Hit: (5d12+7) [Force] damage.

Arminger Weapon. Ranged Weapon Attack: +9 to hit, range 80/240 ft., 1 target. Hit:  (1d10 + 5) [Force] damage.

Royal Retribution. Ardyn Makes 13 Arminger Weapon Attacks (Recharge 5-6)

Daemonification. Melee Weapon Attack: +11 to hit, reach 5 ft., 1 target. Hit: (4d8+7) [Necrodic] damage. Damage Dealt you gain as temporary hit points.

Rising Phantom. Melee AOE Attack. All Creatures Within 30ft of Ardyn must make a DC 20 Dex Save or Take (8d10) [Force] damage on a fail and half as much on a save. (Recharge 5-6)

Phantom Fade. Ardyn Moves 100ft, During this He is immune to all damage and can phase through solid materiel but cannot end his turn in solid material.

Spell. Ardyn casts a spell if he has not already

Shadowstep. Ardyn Teleports 20 Ft Away

Parry. When Ardyn is attacked he can add a +7 to his ac, possibly causing the attack to miss

Ardyn Has 5 Legendary Actions and Gets one more per 4 People in the Party

Aminger Flurry (Costs 1 Actions). Ardyn Makes 3 Arminger Weapon attacks.

Daemonification (Costs 1 Actions). Ardyn makes 1 Daemonification attack.

Spellcasting (Costs 2 Actions). Ardyn Casts one of his at will spells.

Scythe of Rage (Costs 3 Actions). Ardyn Makes one Spectral Scythe attack.

Forced Regeneration (Costs 2 Actions). Ardyn uses his regeneration.

Reposition (Costs 1 Actions). Ardyn Uses his phantom fade ability.