The end is also the beginning.

It seems to be millinium. He has been stuck in this place for more than a few millinium. He only have the company of books. which seems endless. He was a proud son of heavens. When he was a child he has been found by the sect master with the highest aptitude for cultivation in 1000 years. In less than 1000 years he has became the one of the strongest possible known cultivator. He had been only two steps away from shedding mortal flesh. There always had been legend saying people becoming immortal. They say they existed but after shedding mortal flesh they leave the plane and for further cultivation they travel to the higher plane.
To his bad luck when he just became sect leader he found he soul is not complete. He started travelling for various soul supportive penecka or heavenly treasure after a period of time he found that a flower named heavenly soul flower can help him to find his other half of the soul. But it had been seen in the depth of a forbidden zone.
He care less about the danger as without his complete soul he would die anyway.
So he started his journey towards the famous forbidden zone. Due to his incomplete soul he has no fear or feelings whatsoever, for anything even his birth place, parents.
When he at last found the heavenly flower stumbled upon a misterious heavenly treasure. Which had been hidding in that place, and when he approached it, it directly shoot towards his eyebrows after that he lost his consciousness. And he appeared in this void full of books and knowledge, he can't cultivate here so he decided to study he had memorised every book and digested it's contents. And this book is the last one. As he finally memorised the last book he was suddenly surrounded by a blinding white light and lost consciousness.