Magic:Undeath to Death

Necromancy [ Negative ]
Level: Clr 6, Sor/Wiz 6
Innate Level: 6
Component(s): V, S
Casting Time: 1 action
Range: Medium
Target: Colossal
Duration: Instantaneous
Counter(s): --
Saving Throw: Will negates
Spell Resistance: Yes
Metamagic: Empower, Maximize, Quicken, Silent, Still
Energy Substitution: No

This spell slays 1d4 HD worth of undead creatures per caster level (maximum 20d4). Creatures with the fewest HD are affected first; among creatures with equal HD those closest to the point of origin of the burst are affected first