Aura of False Divinity. A creature that starts its turn within 30 feet of Xaroman must make a DC 20 Wisdom saving throw, provided Xaroman isn’t incapacitated. On a failed save, the creature is charmed by the radiant idol. A creature charmed in this way can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. Once it succeeds on the saving throw, a creature is immune to this radiant idol’s Aura of False Divinity for 24 hours.

Legendary Warcaster. Xaroman has advantage on Concentration checks made to maintain concentration on his spells and may cast spells with somatic components even while both of his hands are occupied. Additionally, any time he takes the attack action or could make an attack of opportunity, he may cast a spell with a casting time of one action, bonus action, or reaction which targets only one creature in place of one of the attacks he could make.

Legendary Resistance (3/Day). Any time Xaroman fails a saving throw, he may instead succeed that save. Once he has done so 3 times, he cannot do so again until the next dawn.

Legendary Strike (3/Day). Any time Xaroman fails an attack or spell attack roll, he may choose to instead succeed the attack roll. This attack roll cannot score a critical hit. Once he has done so 3 times, he cannot do so again until the next dawn.

False Divinity's Senses. Xaroman is continuously under the effects of the detect evil and good and detect magic spells. Entering or beginning  his turn in an area affected by antimagic field or a similar effect, or being targeted by dispel magic disables this trait until the next turn Xaroman starts outside of such an effect, or until the start of his next turn.

Innate Spellcasting. Xaroman’s spellcasting ability is Charisma (Spell Attack: +12 to hit, spell save DC 20). Xaroman can innately cast the following spells as a 13th level spellcaster, requiring no material components:

At will (cast at 3rd level if applicable): aid, burning hands, charm person, cure wounds, detect evil and good, disguise self, divine smite, guiding bolt, levitate, light, sacred flame, spare the dying, thaumaturgy, zone of truth

5/day each (cast at 3rd level): bane, bless, infestation, searing smite, raise dead, scorching ray, suggestion

3/day each (cast at 5th level): banishing smite, flame strike, mass cure wounds, revivify

1/day each (cast at 7th level): commune, dominate person, insect plague, mass suggestion

Magic Resistance. Xaroman has advantage on saving throws against spells and other magical effects.

Multiattack. Xaroman makes three melee attacks or three Radiant Blast attacks. Xaroman may replace one of these attacks with a single target spell with a casting time of one action, bonus action, or reaction that he knows.

Xaroman's Blade. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 15 (2d6 + 8) slashing damage plus 20 (3d10+5) radiant damage. Any creature struck by this attack must succeed a DC15 Constitution saving throw or be blinded until the end of their next turn.

Radiant Blast. Ranged Spell Attack: +12 to hit, range 120 ft., one target. Hit: 17 (3d6 + 7) radiant damage. Any creature struck by this attack must succeed a DC20 Constitution saving throw or be blinded until the end of their next turn.

Radiant Strike (1/Day). The radiant idol chooses a point on the ground it can see within 60 feet of it. A 30-foot-radius, 40-foot-high cylinder of bright light appears there until the start of the radiant idol’s next turn. Each creature in the cylinder when it appears or that ends its turn there must make a DC 20 Constitution saving throw, taking 55 (10d10) radiant damage on a failed save, or half as much damage on a successful one.

Retaliatory Strike. As a reaction to being targeted by an attack from a creature Xaroman can see, he may make one melee attack or radiant blast attack against that creature.

Divine Barrier (Recharge 1 Round). As a reaction to being targeted by an attack or spell attack, Xaroman may erect a divine barrier which grants him +5 to his armor class and immunity to magic missiles until the start of his next turn. After using this ability, he cannot use this reaction again until the start of the turn following his next turn.

Xaroman has 3 legendary actions which he may use after any other creature ends its initiative, and that he regains at the start of each of his turns.

Attack. As a legendary action, Xaroman may make one melee attack or one radiant blast attack against a creature he can see.

Cast Spell. As a legendary action, Xaroman may cast one spell with a casting time of 1 action, bonus action, or reaction.

When Xaroman drops below 100 hit points, his mythic combat stage begins, causing him to instantly raise back to full health, and he retains his Mythic Combat form for 1 minute or until he is slain. After this minute has passed, Xaroman cannot reenter his mythic combat stage until the next dawn.

While in his mythic combat stage, Xaroman is constantly under the effects of his Divine Barrier, and can no longer use it as a reaction.

While in his Mythic Combat stage, Xaroman adds his Charisma Modifier to all spell damage he inflicts, and increases his spell save DC to 25.