Archons’ light radius should be a passive aura area-of-effect attack that causes strong light effects: potentially blinding normal monsters, hurting gremlins and undead, petrifying trolls, and so on.

Archons block teleportation on any level they’re on like demon lords do, because they’re otherwise too easy to avoid.

Wielding Sunsword protects you from being blinded by an Archon’s radiance.

Archons emit light, in a radius of 2 or 3.

There should be one major monster of each alignment that is ungenocideable: Archon for lawful, deep ettin for neutral, arch-lich for chaotic.

Any gaze attack which is prevented by blindness (one which is visual in nature) is prevented by hallucination, or at least the effects are reduced or mitigated. Possibly archons’ blinding gaze should be exempted from this, with the hallucinatory message being “The power of the Aurora overwhelms you!”