根据《不死之书》(Libris Mortis – the Book of Undead)第151页关于「巫妖命匣」第二段的说明:
A lich may construct only a single phylactery. A lich whose phylactery is destroyed suffers no harm, but cannot construct a new one. If a lich without a phylactery is slain, the lich is forever destroyed.
巫妖只能制造一个命匣。虽然巫妖的命匣被毁时它不会受任何伤害,但它也无法再制作一个新的。若巫妖在失去命匣的情形下被摧毁,那么它就真的被轰杀了。