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3.5 ed. rules
The object touched shed light brighter than bright sunlight, channeled directly from the celestial realms. The light extended to a 120-foot radius: bright light to 60 feet and dim light in another 60 feet.
Creatures with light sensitivity (such as drow) took twice the usual penalty when they are within 60 feet of the object. Undead creatures took damage each round they are within the bright light. Fiends, as well as undead creatures that were specifically harmed by sunlight, took even more damage.
Celestial brilliance brought into an area of magical darkness (or vice versa) was temporarily negated, so that the otherwise prevailing light conditions existed in the overlapping areas of effect.