Undeath to Death (Necromancy)
Level: Priest 6, Mage 6, Paladin 5
Will negates. Mana: 12. Base Success: 90%.
  Destroys undead creatures within a 40-foot (4 square) radius burst centered on a point you choose. The spell destroys up to 1d4 Hit Dice of undead per caster level (maximum 20d4). Undead with the fewest Hit Dice are affected first; among equals, those closest to the center go first. An undead creature of 9 or more Hit Dice is unaffected, and Hit Dice too few to affect the next creature are wasted. Each affected creature may make a Will save to negate the effect, but its Hit Dice still count against the total.