Angelic Weapons. The archon's weapon attacks are magical. When the archon hits with any weapon, the weapon deals an extra 3d8 radiant damage (included in the attack).

Axiomatic Mind. The archon can't be compelled to act in a manner contrary to its nature or its understanding of justice.

Innate Spellcasting. The archon's spellcasting ability is Charisma (spell save DC 17). The archon can innately cast the following spells, requiring only verbal components:

At will: detect evil and good

1/day each: destructive wave, geas

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

One Being. Though it appears as a humanoid creature riding a mount, an archon is a single being. The "rider" can't be dismounted, and no other means can separate the two portions of the archon's being short of its death.

Multiattack. The archon makes two attacks: one with its sword and one with its claws.

Sword. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) slashing damage plus 13 (3d8) radiant damage.

Claws. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 11 (2d6 + 4) piercing damage plus 13 (3d8) radiant damage.