Board Thread:Theories and Speculation/@comment-30241447-20170503042327/@comment-734582-20170517063000

QuakingStar wrote: The databook calls them spiritual weapons, what they mean by spiritual is never detailed. So it could mean weapons made from half of the ingredient of chakra(spiritual energy) or weapons made of chakra themselves?? They could even be physical items that give rise to spiritual weapons. The Totsuka Blade emerges from a Sake Jar. Not sure about the Yata mirror. But it's possible that Itachi found a physical Sake Jar, which (presumably with chakra input) forms a spiritual blade. I guess Itachi saw an opportunity and channeled the item through his Susanoo, so he can simply trick people with a Totsuka that looks just like a regular Susanoo blade.

As to whether they're chakra or some real spirit form, i honestly don't know. I don't see any evidence that it's either. I mean a literal spirit blade wouldn't be able to hurt anyone as we saw with e.g. Reaper Death Seal or Spirit possessing. But we've seen that spirits can have chakra, so it would be very easy to argue that a literal spirit blade simply gets coated in chakra to manifest, the spirit part providing the sealing and the chakra part forming the blade.