MTL - Nightmare’s Call (Summoner of Nightmares) - Chapter 21

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

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.

“Emperor 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 Lord 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!

- Description from Novelupdates

Immortal arts, magic weapons, magical powers, and the boundless spiritual qi between heaven and earth vanished into obscurity overnight, and all exorcists turned to mere mortals. Three hundred years later, the Five Hus traversed the pass, it was a prelude to an era of great turmoil in China. They heralded the end of the world, where thousands of drought fiends stalked the night —— the collapse of the Divine Land is imminent. Fortunately, within this long, dark night where silence had fallen on all magic, a lone star still glistened brightly on the horizon. The Heart Lamp appeared, illuminating the vast expanse around it. A sixteen-year-old young man, who will end his life on his twentieth birthday, embarked on a journey to reclaim the spiritual qi of heaven and earth that had been sealed away —— only four years remain. The road ahead was filled with countless thistles and thorns, and it seemed improbable for him to succeed. ———— Chen Xing: “The important thing is that I’m the last exorcist in this world, yet the only magic I am capable of is emitting light. What can I do?” Wait patiently then. When the Dinghai Pearl reappears on earth, the uncertain trajectory of everyone’s fates will be completely disrupted before converging once more. Chen Xing: “Could I be partnered with a more normal Protector Martial God?” Isn’t your Protector really skilled in fighting? Chen Xing: “He is good at fighting, but when he loses it he’ll hit even me……” There’s nothing that can be done about that, you can only blame yourself for losing yourself to lust.