Board Thread:Theories and Speculation/@comment-31477926-20170702121758/@comment-734582-20170819091245

LordGriffin1000 wrote: I mean yes the writer could write something and we could believe it but if nothing backs up the claim (especially one this big) you can't just agree and say it can. The databook entries are likely composed from Author's notes from Kishimoto. These notes are apparently not fact checked very toughly (again: plenty of contradictions). Sure, it's possible Kishimoto intended to reveal more of the Yata Mirror and Totsuka blade, but it seems to be a largely abandoned arc.

Namikazenaruto9 wrote: Its quite possible he is talking about nature transformation. We don't know. But we do know that Itachi did not manifest Yata to block Kabuto's flashbang, even though it put them in massive danger. Even as an Edo Tensei, whatever cost is associated with Yata isn't worth paying. Alternatively, we've misunderstood those words and it simply cannot block those light and sound waves, and so the whole "change it's properties" part isn't what we think it is.

For instance, maybe the Yata can only change properties to a limited degree (e.g. it can be made to block sound but not light or vice versa). Perhaps changing properties has a good dose of realism added to it (becoming highly sound dampening makes it far more brittle and susceptible to physical attacks). perhaps it costs too much chakra to be worth it, or it taxes his eyes to such an extent that even an Edo form can't protect him.

Either way, even though we don't understand the specifics of the Mirror, it's evident that it has both a high cost and cannot be as invincible as it's made out to be, simply because of how Edo itachi used it.