Undeath to Death

At 3rd level, and every two levels thereafter, a sorcerer learns an additional spell, derived from her bloodline. These spells are in addition to the number of spells given at new levels. Undeath to Death: This spell snuffs out the life force of undead creatures, killing them instantly. The 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 who are closest to the burst's point of origin are affected first. No creature of 9 or more HD can be affected, and HD that are not sufficient to affect a creature are wasted.