a +3 unholy crushing heavy mace.
The crushing special quality crushes the skulls of those it strikes. Upon a successful critical hit, the weapon crushes the opponent’s skull (if it has one) instantly killing the target. Some creatures, such as many aberrations and all oozes, have no skulls, others, such as golems and incorporeal undead, are not affected by the crushing special quality. Most other creatures, however, die when their skull is crushed.