D.E.M.O.N.S: Getting Summoned Weekly isn't so Bad - Chapter 125: The Four ‘Best’ Weapons

Never underestimate the guy who has so much Mana it should kill him...Nathaniel's bus ride was supposed to be just another boring commute. But now, he, 23 fellow passengers, and a corgi named Biscuit are stuck in a “Hell difficulty” tutorial, battling monsters and leveling up.Easy difficulty, anyone can handle. Normal difficulty, you've got to put up a fight to get by. Hard difficulty is where only the tough ones last. And Hell? That's where you have to be a bit out of your mind!With his terrifying talent for mana manipulation, Nathaniel decides to invest every stat point into mana. Attribute imbalance be damned. It will either kill him before the monsters and his enemies can, or turn him into one of the most powerful beings within the system.

Why, seems like I’ve become a haunted portrait.

Pausing time, turning back time, reversing times of specific objects/person, and even predicting the future…

Taking advantage now that Su Lin has control of time within his grasp. Being able to stop time; can dodge incoming attack and avoid mishaps, Su Lin is steered clear of harm’s way. Reversing time; can forever never regret, no need to overthink when acting. Inverting time of specific object/person; can repair any object and heal any person, Su Lin becomes a miracle doctor. Predicting the future; can hide from natural disasters, can buy the winning lottery tickets and stocks, listening to Su Lin is always right.

- Description from Novelupdates

Qin Chen was transmigrated to the Taiyi Holy Land where he became a servant in charge of sweeping the floor. However, on his 16th birthday, he was rewarded with a system where he was rewarded whenever he signed in at a new place.

When he signed in at the Empire Ruin, he was rewarded with the strongest Chaotic Holy Body and the Chaos Emperor Scripture.

When he signed in at the Demon Sealing Land, he was rewarded with the Probationary Royal Armies.

When he signed in at the Alchemy Palace, he was rewarded with the Divine-grade Alchemy.

When he signed in at the Herb Garden, he was rewarded with an Immortality Elixir.

When he signed in at the Empire Palace, he was rewarded with the Emperor-grade Divine Art, Revival.

…

Qin Chen thought he could just spend the rest of his life signing in at different places until he became invincible.

However, when the ruin of the Great Kingdom appeared inside the holy land, people from other holy lands, prestigious families, and even ancient empires gathered to defeat the All-Powerful Demon King who appeared with the ruin. The Demon King had killed countless people and had planned to destroy the Taiyi Holy Land.

Qin Chen was left with no choice but to step up. When he killed the Demon King with a single slap, he sighed, “Why do you guys have to force a mere servant to act?”