Avelyn; Hollow Prince

Magic Weapons. The Hollow Prince's weapon attacks are magical.

Spellcasting. The Hollow Prince is a 9th-level spellcaster. Its spellcasting ability is  (spell save DC 18, +9 to hit with spell attacks). The Hollow Prince has following Paladin/Cleric spells prepared:
Cantrips (at will): Hand of Radiance, Resistance, Sacred Flame (4th), Word of Radiance (4th)
1st level (9 slots): Thunderous Smite, Divine Favor, Shield of Faith, Sanctuary
2nd level (8 slots): Branding Smite, Hold Person
3rd level (7 slots): Branding Smite (2nd), Blinding Smite, Crusader's Mantle, Spirit Shroud
4th level (6 slots): Branding Smite (3rd), Spirit Shroud (2nd), Staggering Smite
5th level (5 slots): Branding Smite (4th), Destructive Wave, Dispel Evil and Good, Circle of Power
6th level (4 slots): Branding Smite (5th), Spirit Shroud (3rd), Blade Barrier, Sunbeam
7th level (3 slots): Branding Smite (6th), Symbol
8th level (2 slots): Branding Smite (7th), Spirit Shroud (4th), Earthquake, Sunburst
9th level (1 slot): Gate

Multiattack. Avelyn can strike twice for every Action.

Sword of Kings. Melee Weapon Attack: +12 to hit, reach 5 ft., 1 target. Hit: 26 (4d12 + 8) Slashing damage plus 19 (3d8 + 5) Elemental damage.

Light's Boon. Ranged Weapon Attack: +8 to hit, range 10/20 ft., 1-3 target. Hit: 24 (3d10 + 8) Radiant damage plus 18 (3d8 + 4) Elemental damage.

Any Bonus action spells.

Opportunity Attack. 

Avelyn can take a Legendary Action once outside of his turn and at the end of every round he restores 1d4 of his Legendary Actions
(Base Amount: 5)

Elemental Pact (Costs 1 Actions). Avelyn switches the added element of his Sword of Kings to either of the following:
Fire
Cold
Lightning
Force
Thunder
Radiant (Base)

Avelyn can channel the power of the Deities before him, costing one Mythic Action and restore 1d4 after every two rounds of combat.
(Base Amount: 5)

Felein's Grace (Costs 1 Action). Avelyn crouches down into a prayer, cloaking himself in a wispy shield of light that receives any incoming spell attacks and redirects them randomly around the battlefield (Roll a D100 and DM's Discretion).

Rufian's Might (Costs 1 Action). Avelyn channels the fury that was Rufian, granting him advantage on all STR-related rolls, advantage to hit and an additional 2d8 on all attack rolls for the next 3 rounds of combat.

Kylptos's Rage (Costs 1 Action). Reminding oneself of the Brimstone Domain and the path of kingdom below, the injustice bestowed to it. Engulf the Sword of Kings into a stronger furl of elements, converting all Elemental damage rolls into d10s.

Azareas's Heir (Costs 2 Action). Despite your lineage, despite what he's done to your name and history, your path is yours to carve and yours alone. Bolster your resolve and remember what you'll leave behind; granting yourself 150 Temp HP (first use) and restoring 50 HP for every subsequent reminder.