A circle of death snuffs out the life forces of living
creatures, killing them instantly.
The spell slays 1d4 HD worth of living 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 point of origin of the burst are affected first. No creature
with 9 or more HD is affected, and HD that are not sufficient to
affect a creature are wasted.