The Gaming Den

I kind of like the looks of Celestial Brilliance (Book of exalted deeds pg 94), Cleric 4, Glory 4, sorcerer/wizard 4

It's an decent light source, at a level were you should be using Superior Darkvision and not caring about light, but it’s an attack spell that lasts 1 day per level, hits a 60 ft. radius, and costs nothing.

"Undead creatures take 1d6 points of damage each round they are within the bright light. Evil outsiders, as well as undead creatures that are specifically harmed by sunlight, take 2d6 points of damage each round in the bright light."

Assuming no one in the party is hurt by the things why would you not have about 20 of these...

Speaking of BoED, Starmantle as written works with Evasion.

Undead bane weapon lasts 1 hour/level in Libris Mortis, making the Undead bane weapon enhancement largely pointless.