The Golden Register of Ascension

The strange man who came to lodge at his home is actually the legendary sword immortal?

The crystal bottle he receives from him can actually absorb other people's souls.

The battered old book is actually a cultivation technique that opens the door to the Immortal Realm.

A boy from the mountains meets a genius sword immortal, revealing a corner of that mottled world.

When they meet again in the cultivation world, the sword immortal who once shone brighter than anyone has become a woman...