Anemos Delacroix, the Corrupt King

Second Wind( Celestial Aura). After half his hit points are lost, Anemos' hair begins glowing radiant gold and is given a glorious aura. Saving throws on Intimidating Pulse are given disadvantages. He is now resistant to radiant and necrotic. All magical effects that were placed on him, end. Additionally, his A' Daragon Family Weapons now does any extra 1d6 radiant on each strike. Eldritch Blast now does an additional 2d6 radiant. Anemos' movement increases by 30ft. 

Ring of Suppressive Image. After Anemos' hit points have depleted this ring on his right index finger breaks in half. The armor and weapons are left on the ground become hollow as his body evaporates and a translucent bright, yet tall humanoid form is left in his place. Wind gusts start blowing around this form at great speeds. His form becomes another homebrew monster sheet with 1/3 the hit points ignore lair actions, description, and that he can speak Auran. 

Spellcasting. Anemos is a 10-level spellcaster. Its spellcasting ability is Charisma (spell save DC 22, +11 to hit with spell attacks). Anemos has the following spells prepared:
Cantrips (at will): Eldritch Blast, Shocking Grasp
1st level (5 slots): Fog Cloud, Thunderwave 

2nd level (3 slots): Gust of Wind, Levitate, Warding Wind

3rd level (2 slots): Fly, Wind Wall

4th level (1 slots): Control Water

5th level (1 slots): Conjure Elemental

Spellcasting. Anemos can cast two spells in a single turn, two cantrips or one cantrip and a concentration spell.

Multi-Attack. Anemos can make three Melee Weapon Attacks or Ranged Weapon Attacks

King A' Daragon's Longsword. Melee Weapon Attack: +13 to hit, reach 10 ft., 1 target. Hit: 11 (1d12 + 5) magical slashing damage. add 2 (1d4) ice damage and 2 (1d4) radiant damage

Queen A' Daragon's Longbow. RangedWeapon Attack: +10 to hit, range 120/300 ft., 1 target. Hit: 8 (1d8 + 5) magical piercing damage. Add 7 (2d6) necrotic damage.

Opportunity Attack.

Anemos has legendary actions related to his armor and each legendary action he can use has its own set rules. At most, two legendary actions are usable per his turn.

Intimidating Pulse (Costs 1 Action). Only once per round, Anemos may glare at a single opponent with the cosmos resonating in his eyes similarly with his armor. The opponent must succeed on DC 20 Wisdom Saving Throw or be made unconscious for 3 rounds of combat. This is considered a magical effect and works as a sleep spell. 

Chestplate of the Cosmos with the A'Daragon Family Sword (Costs 1 Action). Anemos with his sword merges the starlight of his armor together which forms into a ball of light enshrouding Anemos completely. He teleports in any direction 60 ft. (faster than the blink of an eye). Only usable after three rounds of allowing the chest plate to regain its shimmer. If used during Second Wind (Celestial Aura), Anemos can change the duration of teleporting to be up to two rounds with a minimum of one round. The starlight is shown with more radiant and lasting brightness. The movement is also increased by 60 ft for the teleport and Anemos' AC increases to 40 while in transition. All non-magical damage is nullified during transition. Anemos can't control the direction in transit so he rolls a d8 for direction, per round in transit. He can only go down while in the air and negate fall damage, but can't go upwards. Anemos can't take actions of any kind while in this state.

The following Legendary action is also usable as an additional reaction and can be used once per round.

Greaves of the Cosmos (cost 1 action). Either on his turn or as a reaction Anemos may choose to nullify 1 magical spell that would be cast or was already cast to end its effects. If the spell caster is currently concentrating on the spell he desires to nullify then the caster must succeed on a DC 20 Wisdom Saving Throw to keep his/her mental focus on the spell.