I will become the Demon Immortal known to the whole world - Chapter 420 - 14: The Envelope from the Previous Era

Yo, Hi! I’m Frank, I made a deal with a demon to pay me some money for receiving a guest for a few days every week.
I had no idea about what I have done.
On May 1st, Conan ‘the God of Death’ came to my house. I was forced to let him in and we get involved in a criminal case.
On May 8th, Bruce Wayne ‘Batman’ came to me. I was forced to follow him to fight crime.
On May 16th, Hannibal Lecter, The Silence of the Lambs, came to my home. I can only say that I really can’t stand my guests.

- Description from Novelupdates

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.

Every human has their Personal Jewel of power, when awakened it can either be an Elemental Jewel or Physical Jewel. They circle the right and left wrists like bracelets of power.