Gage: "You know, while I was over on my vacation in Japan, I stumbled across this. Legend has it that it's a mirror once carried by the legendary folklore figure Tamamo-no-Mae, capable of reflecting the light of the Sun wherever it went. Of course, if it was actually magical, we'd be having a different conversation right about now, but at least you can still wallop someone with it if you really want to."
Adds Tamamo no Mae's mirror... thing to the game as an add-on melee weapon to bonk people over the head with.
Still stronger than her noble phantasm.
Goes into mod_overrides.
Known issues:
Spoiler!
Hands clip through mirror bauble things when winding up. This is probably unresolvable without sacrificing the (beautiful) briefcase animations.
Also this happens sometimes:
It goes away if you hit the melee key again though.