AU!
when nahida checking some data, she distracted by a book that she even doesn't know. she feel something weird from the book and tried to hold it. when she hold the book, she felt something. with brave heart, she open that book and she suddenly teleported to the other world.
gnosis is one of the intermediaries to obtain information about the "book".
Fyodor as Dottore
Oke guys, I actually know that greater lord is not Nahida, I'm just too lazy to explain. I'm sorry