The harem that was introduced are zanpakutou, obviously they are not swords so I can only assume that they are the spirits that live within. If he said he created said spirits so it seems like he is capable of creating souls. So again, referring to my previous comment, "So this King of Swords guy not only forges the weapons but by the looks of it creates the souls that go into them?". Whether or not he has something to do with the manifestation or creation of each Shinigami's Zanpakuto is beyond me and seems unlikely, but its still quite radical that he seems to have the ability to create souls period.
Originally Posted by xxDoLLarBiLLxx
He's the creator of zanpakutos. Whatever that means.
If you remember, when Ichigo was bankai training, he materialized Zangetsu (with the help of a device). Seeing as how hat-sandals copied a lot of things from Div. Zero, I'm guessing this is also one of them.