Three of them - the Kōkinjō, the Shichiseiken and the Benihisago - can be used to curse a person through their "word soul" and to trap them if they pronounce it or don't say anything for enough time. The fourth one is the Bashōsen which allows the user to wield all five elements. The last one is the Kohaku no Jōhei which can also be used to seal enemies, but without the complex procedure of the first three weapons.