Carbunculus, Seraph of the Phoenix

Holy Incandescence. Carbunculus’s weapon attacks and spells ignore resistance to fire and radiant damage, and treat immunity to these damage types as resistance.

Aura of Judgement. Creatures of Carbunculus’s choice within 60 ft. take 20 (4d8+2) radiant damage at the start of their turns and must succeed on a DC 23 Wisdom save or be frightened until the start of their next turn. Allies in the aura instead gain 20 temporary HP at the start of their turns. This effect activates once, upon entering that 60ft aura.

Trial by Flame. When a creature damages Carbunculus with an attack or harmful spell, it is immediately wreathed in a halo of golden fire until the start of its next turn.

• While marked by this halo, the creature has disadvantage on attack rolls against any creature other than Carbunculus.

• At the start of its turn, the creature takes 30 (6d10) radiant damage unless it succeeds on a DC 23 Constitution saving throw.

• If the creature reduces an ally of Carbunculus to 0 HP while marked, it instead explodes in a burst of holy fire, each creature within 10ft of the creature must make a DC 18 Dexterity Saving Throw or take 30(6d100 Radiant Damage.

Divine Arbiter of the Eternal Flame. Whenever a hostile creature within 60 feet of Carbunculus dies, it is immediately consumed in a pillar of golden fire.

• The creature’s body is reduced to ash (preventing resurrection short of a wish or divine intervention).

• A Celestial Soldier (CR 10) made of living flame rises from the ashes under Carbunculus’s control.

• These soldiers last until destroyed or until Carbunculus is reduced to 0 HP.

Spellcasting. Carbunclus is a 9th-level spellcaster. Its spellcasting ability is [Charisma] (spell save DC 23, +16 to hit with spell attacks). Carbunculus has following the spells prepared:
Cantrips (at will): [Green-Flame Blade], [Fire Bolt]
1st level (4 slots): [Faerie Fire], [Scorching Ray]
2nd level (3 slots): [Flame Blade], [spell name]
3rd level (3 slots): [Fireball], [Flame Stride]
4th level (3 slots): [Wall of Fire], [Conjure Elementals]
5th level (2 slots): [Flame Strike], [Immolation]
6th level (2 slots): [Sunbeam], [Investiture of Flame]
7th level (1 slots): [Fire Storm], [Delayed Blast Fireball]
8th level (1 slots): [Incendiary Cloud], [Sunburst]
9th level (1 slots): [True Resurrection], [Meteor Swarm]

Multiattack. Carbunculus makes three attacks, two with his Solar Blade and Flameburst Lance.

Solar Blade. Melee Weapon Attack: +16 to hit, reach 15 ft., 1 target. Hit: 38 (6d8+10) slashing + 27 (6d8) radiant damage.

Flameburst lance. Ranged Spell Attack: +# to hit, range 180 ft., one target. Hit: 35 (6d10+6) fire damage, and target must succeed on a DC 23 Con save or be blinded until end of its next turn.

Wings of the Phoenix. Carbunculus unfurls his fiery, multi-ringed wings and launches himself in a blazing arc. He can do this 3 times a day.

• He flies up to 60 ft. without provoking opportunity attacks.

• All creatures he flies past take 4d10 fire damage and must succeed on a DC 23 Strength saving throw or be knocked prone.

Guardian's Intercession. When a creature Carbunculus can see within 30 ft. would be hit by an attack, Carbunculus can flash-step in a blaze of light, teleporting to an unoccupied space adjacent to that creature.

• The attack is redirected to him instead.

• He gains resistance to all damage from the triggering attack.

Purifying Rebuke. When a creature hits Carbunculus with a melee attack, holy flames erupt from his body.

• The attacker takes 4d10 radiant damage and must succeed on a DC 23 Constitution saving throw or be blinded until the end of its next turn.

Carbunculus has 3 Legendary Actions per round.

Blazing Wings (Costs 1 Actions). Carbunculus beats his fiery wings, dealing 4d10 fire damage to creatures within 15 ft. and pushing them 20 ft. (DC 23 Strength save halves and negates push).

Divine Reposition (Costs 1 Actions). Teleport up to 60 ft. to an unoccupied space he can see. Allies within 30 ft. can immediately move up to half their speed.

Radiant Lance (Costs 1 Actions). Make one Flameburst Lance attack.

Cleansing Nova. When Carbunculus is reduced to 0 HP, he explodes in a 60-ft. radius nova of radiant fire (20d10 radiant + 20d10 fire damage, DC 24 Dex save for half), then rises again with a quarter of his maximum HP. He also gains access to Mythic Actions that use the same pool as legendary actions.

Judgement Storm (Costs 2 Actions). Summons a rain of fiery meteors in a 40-ft. radius anywhere within 120 ft. Each creature must make a DC 23 Dex save, taking 12d10 fire and 12d10 radiant damage on a fail, half on success.

Sun's Verdict (Costs 3 Actions and can only be done once.). Carbunculus calls down a beam of divine sunlight in a 30-ft. radius, dealing 30d10 radiant damage DC 24 Constitution Save to all hostile creatures. Any hostile creature reduced to 0 HP by this effect is disintegrated into ash.