Angelic Weapons. Adamus's weapon attacks are magical. When he hits with any weapon, the weapon deals an extra 6d8 radiant damage (included in the attack).

Divine Awareness. Adamus knows if he hears a lie.

Innate Spellcasting. Adamus's spellcasting ability is Charisma (spell save DC 25). He can innately cast the following spells, requiring no material components:

At will: charm person, counterspell, detect evil and good, invisibility (self only)

3/day each: blade barrier, dispel evil and good, dominate person, greater invisibility, mental prison

1/day each: commune, control weather, psychic scream, true resurrection

Legendary Resistance (3/Day). If Adamus fails a saving throw, he can choose to succeed instead.

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

Pious Presence. All creatures within 60 of Adamus that can see him, have disadvantage on saving throws against being charmed by him or breaking out of his charm. Additionally if him damaging a creature would break his charm, that creature instead gets to repeat the saving throw.

Zealous Revitalization (Mythic Trait; Recharges after a Short or Long Rest). 
If Adamus is reduced to 0 hit points, he doesn't die or fall unconscious. Instead, he regains 493 hit points. In addition, Adamus sprouts 2 more wings and near blinding radiant halo appears above his head. He no longer provokes attacks of opportunity and has 2 reactions per round.

Multiattack. Adamus makes 3 attacks: Two with his Rapier and one with Kindness

Rapier. Melee Weapon Attack: +15 to hit, reach 5 ft., one target. Hit: 21 (3d8 + 8) piercing damage plus 27 (6d8) radiant damage.

Kindness (Whip). Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 28 (8d4 + 8) slashing damage plus 27 (6d8) radiant damage. Additionally weapon radiates a burst of psychic energy that deals  10 (4d4) psychic damage to each creature within 30 feet of it, creatures charmed by Adamus are immune to this damage.

Devout Longbow. Ranged Weapon Attack: +15 to hit, range 150/600 ft., one target. Hit: 17 (2d8 + 8) piercing damage plus 27 (6d8) radiant damage. If the target is a creature that has 100 hit points or fewer, it must succeed on a DC 15 Constitution saving throw or have it's hit points reduces to 0. If a creature's hit points are reduced to 0 in this way, it gains 50 temporary hit points and is charmed by Adamus, following his commands and seeing only him as an ally. These temporary hit points are removed if the charm is broken. If the creature is immune to being charmed they die instead.

Flying Sword. Adamus releases his Rapier to hover magically in an unoccupied space within 5 feet of it. If Adamus can see the sword, he can mentally command it as a bonus action to fly up to 50 feet and either make one attack against a target or return to the his hand. If the hovering sword is targeted by any effect, Adamus is considered to be holding it. The hovering sword falls if the solar dies.

Healing Touch (4/Day). Adamus touches another creature. The target magically regains 40 (8d8 + 4) hit points and is freed from any curse, disease, poison, blindness, or deafness.

Adamus can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The solar regains spent legendary actions at the start of its turn.

Teleport. The solar magically teleports, along with any equipment it is wearing or carrying, up to 120 feet to an unoccupied space it can see.

Searing Burst (Costs 2 Actions). The solar emits magical, divine energy. Each creature of its choice in a 10-foot radius must make a DC 23 Dexterity saving throw, taking 14 (4d6) fire damage plus 14 (4d6) radiant damage on a failed save, or half as much damage on a successful one.

Blinding Gaze (Costs 3 Actions). The solar targets one creature it can see within 30 feet of it. If the target can see it, the target must succeed on a DC 15 Constitution saving throw or be blinded until magic such as the lesser restoration spell removes the blindness.

If Adamus's mythic trait is active, he can use the options below as legendary actions for 1 hour after using zealous Revitalization

Kindness in return. Adamus makes 2 attacks with Kindness. A creature hit by Kindness in this way must make a DC 18 Wisdom saving throw each time they are hit. On a failure  the creature's Wisdom Score is reduced by 1d4. If the creature's Wisdom score is reduced to 0 in this manner, they are immediately charmed by Adamus and follow his telepathic command. If the creature is immune to the charmed condition it is instead stunned until it regains at least one point of Wisdom or until magic such as the greater restoration spell removes Ability Score reduction.

Hear Me Now(Costs 2 Actions). Adamus makes a command with divine authority. Each creature of his choice in a 10-foot radius must make a DC 25 Wisdom saving throw, he telepathically issues commands to all those who fail the save. On their turn they have to spend there action attempting to complete the whatever they were instructed to do as though under the effects of the command spell.