A radiance is a vertical disc of light that hovers behind a creature’s head. Radiances come in many designs and colors, but tend to be evocative of their history and power. For example, a fiend’s radiance may be red and have a spiky, sharp design, while a nature mage’s radiance could display all the elements they are capable of controlling. While most of their patterns are unique, some display the holy symbols of deities, national iconography, or other details.
Radiances can only be equipped in the head, neck, or shoulders slots, and negate the effects of any other item equipped in that slot while active. Collectively, these are referred to as the “radiance” slot, and the user can change which slot the radiance is equipped to as a free action during their turn. A user who willingly disables a radiance can convert it into a flat disc of metal with the same design, allowing them to give the radiance to someone else. If they do not remove it, the radiance is simply not present (or detectable) while inactive. A creature cannot be mind-controlled into removing or disabling a radiance.
A creature can only equip one radiance at a time. If they remove one, they must wait 24 hours to equip a different one, although they may re-equip the one they used before whenever they want. All radiances are minor artifacts, and both the radiance and its effects are immune to antimagic fields and similar effects. Most radiances are given out by deities or other figures of power and have an overwhelming aura appropriate to their nature. For example, the radiance from a good deity will have an aura of Fate (good), while the radiance from a fire elemental lord will have an aura of Nature (fire). A radiance may register multiple auras if it is appropriate for its styling. All effects of aegises that vary by caster level are treated as if they were cast at caster level 20. If a saving throw is required, the DC is 10 + 1/2 the item’s caster level + the user’s casting ability modifier (or their highest mental ability modifier, if they do not have a casting ability modifier) + their mythic tier (if any). If a radiance’s ability would normally get weaker over time (such as having an aegis that can only ward off a limited amount of damage), that limit automatically resets every round; some effects may recharge slower, as noted in the description for the radiance.
Radiances may include brief reminder text about how abilities operate. These reminders do not supplant the actual rules references; they are just a shorthand for quickly referencing what the effects are supposed to do.