“Of course, I’d just as soon avoid a conflict – but if Nanami Yasuri has Akuto the Eel, we cannot simply look the other way… A dagger that revitalizes and replenishes – I’d heard of this before, but that makes it no less of a threat. Wielded properly, it can be used to raise an undead, undefeatable[14] army. But I thought that no single human being could exercise its full potential. I’m quite impressed that Nanami Yasuri could pick up Akuto the Eel with zero guidance… I suppose we have her eyes to thank for this as well?”

[14] 不死不滅 FUSHI FUMETSU “not dying, not perishing”

Katanagatari Omnibus 3, Page 36