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!
Discord Chat Group: https://discord.gg/ATHVehx

Millman97

Library of Heaven's Path

StarveCleric

Daoist6fubtiW

As he would have to expose the existence of the Library of Heaven's Path in order to explain how he managed to tame those Otherworldly Demonic puppets, Zhang Xuan had planned to have 'Yang Xuan' make an appearance to save the day.

Thus, through his mental connection with his clone, he had the latter appear in Yang Xuan's form.

Zhang Xuan had initially only intended to have Yang Xuan scare the others just a little, but who could have known that he would blow the entire matter way out of proportion?

Looking at the wreckage around him, Zhang Xuan slapped his forehead in frustration.

All his clone had needed to do was prove that he wasn't an Otherworldly Demon, but that fellow actually turned the Elder Hall, along with many other crucial buildings, into rubble…

As for how everything had happened…

The powerful aura, which his clone seemed to emanate, was from Vicious, naturally.

I Nominate Zhang Xuan to Be the Principal