Avici.. the 8th and lowest level of the underground prison. But what is avici? http://en.wikipedia.org/wiki/Avici
But that is just what buddhists say. Kubo might not have meant it to be like that in his story. I guess i just figured that is what he meant when i first read it. I know someone brought up that before. Wonder how that conversation went..
But well, wouldnt hell just be a different dimension as you said leat?
I was just tossing that out there because they seemed to relate and it fit pretty well.