Brilliant

(melee weapons only)**:**A brilliant energy weapon has its significant portion transformed into light, although this does not modify the item’s weight. It gives off light as a torch (20-foot radius). A brilliant energy weapon ignores nonliving matter. Equipment and enhancement Defense bonuses do not count against it because the weapon passes through armor. (Dexterity, deflection, dodge, natural armor, and other such bonuses still apply.) A brilliant energy weapon cannot harm undead, constructs, and objects. Ranged weapons cannot be enchanted with this ability.

Purchase DC Modifier:+3.