Holy Radiance

Type of Feat: Exalted.
Prerequisite: Cha 15, Nimbus of Light, Good Alignment*.
Specifics: You can increase the intensity of the light surrounding you to damage undead creatures. At will, as a free action, you can empower the radiance surrounding you into a blazing glow that sheds bright light in a 10-foot radius. Undead within 10 feet of you take 1d4 damage per round they remain within your halo.
Use: Selected.

(*Note: You can select this feat even when evil or neutral, but it will not give you any benefits, so be smart and don't choose it if you can't use it.)