Heng Sao Tian Ya

Traversing into another world, Zhang Xuan finds himself becoming an honorable teacher. 
Along with his transcension, a mysterious library appears in his mind. 
As long as it is something he has seen, regardless of whether it is a human or an object, a book on its weaknesses will be automatically compiled in the library. 
Thus, he becomes formidable. 
"Monarch Zhuoyang, why do you detest wearing your underwear so much? As an emperor, can't you pay a little more attention to your image?"  
"Fairy Linglong, you can always look for me if you find yourself unable to sleep at night. I am skilled in lullabies!" 
"And you, Demon Monarch Qiankun! Can you cut down on the garlic? Are you trying to kill me with that stench?" 
This is an incredible story about teachers and students, grooming and guiding the greatest experts in the world!
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Millman97

Library of Heaven's Path

StarveCleric

Daoist6fubtiW

"That's right!" Ancient Sage Yan Qing nodded in response. "When Kong shi first noticed the Kunxu Domain, it was nothing more than an ordinary passageway between the Master Teacher Continent and the Azure. The heavy energy that lingered in it wasn't too great then, but he swiftly realized that while humans would quickly lose their lives upon absorbing it, there was a chance that Otherworldly Demons could survive the assimilation of the energy and become tremendously stronger as a result of that. That was also how Vicious came about!

"In order to prevent mankind from being destroyed, Ancient Sage Zi Yuan willingly gave up his life to become the crux of the Floating Coffin Heaven Mending Formation that we have now!"

Nodding in realization, Zhang Xuan recalled another thing that he had noticed in the Kunxu Domain and asked, "What about the Greensprout Wheat and the superior constitution of the ordinary populace?"

The Origin of Aeon of Ancient Sage