Harry Potter: Returning from Hogwarts Legacy - Chapter 160 -

The Five Impurities descend into the Mortal World, and demons run rampant.Holding a volume of the “Monster Chronicles,” Song Lin traverses time and descends into the body of a Daoist disciple at a remote Daoist Temple on the frontier.He observes that in this world, the old energy of the Six Heavens still lingers, and Witches and ghostly paths dominate.Demons and ghosts hold official titles, order is lost, and humans and ghosts are thrown into chaos.Heretical paths act with impunity, abandoning truth for falsehood, allowing the proliferation of evil forces.Amidst the suffering of the Mortal World and the devastation of life, Song Lin discovers that he can enter the mythological and supernatural tales recorded in the “Monster Chronicles” to obtain Daoist Skills.Shan Hai’s strange legends, myths, and supernatural tales; Pre-Qin Qi Cultivation, Taiyi in the Chu Territory, Penglai’s Independent Immortals, Lingnan’s Witchcraft, Kunlun Immortal Mountains…Slay the Evil Demons of the heavens, master thousands of Daoist Skills.The endless path of the Immortal Dao, I shall relentlessly pursue it.

The ordinary world is not ordinary, ordinary people are not ordinary, and safe places are not safe.

This is a story of a passer-by male protagonist who is entangled by various girls with strange hobbies or even non-human beings while surviving in the cracks and opening a harem.

- Description from novelbuddy

This novel is also known as Transcendental Mechanic

What do you do when you wake up and find yourself inside the very game that you love?

What do you do when you realize you that you have not only become an NPC – you have even been thrown back in time to before the game even launched!

What will happen when our protagonist’s two realities coincide?

Han Xiao was a professional power leveler before his transmigration. Using his past life’s knowledge, Han Xiao sweeps through the universe as he prepares for the arrival of the players. This is definitely not your typical transmigration novel.

- Description from novelupdates

This story is set during the end of the Sui Dynasty, a time where multiple powers struggled for supremacy and power.