Assassination System - Chapter 170 The Great War of Demons and Humanity

The thousand-year-old Imperium is crumbling, and war looms on the horizon, bringing with it both brutalities and splendor. Caught in the midst of this chaos is Lansius, an office grunt and veteran MMO player who has been transformed into a medieval peasant. With no wealth, status, or magical abilities, and armed only with his basic knowledge of the art of war, can he endure and thrive in this realistic medieval fantasy realm?Follow Lansius as he moves from one occupation to another, striving to survive during these turbulent times.

You, an ordinary human, transmigrated into this world along with a City-Destroying Calamity—Blood Moon.Just when you thought you could rise to the top of the world by awakening a system, you received the following mission:[Do not harm any living being for 10 years][Reward: Unknown God-Tier Reward]...Ten years later, during the Awakening Ceremony—“Hahaha! This loser actually awakened an F-rank talent—Furniture Craftsman!”“Looks like our academy's carpentry workshop finally has someone to carry on the legacy!”[Ding! Congratulations, host. Mission complete. God-tier reward unlocked.][Ding! Host has obtained: Infinity Skill Points. You can instantly upgrade all skills to their MAX level.][Ding! Host has obtained: Infinite Plunder. You can plunder any unowned skill traits.][Ding! Host has obtained: Infinite Fusion. You can fuse all your existing skills and randomly generate new effects!]...Years later—A lean, handsome figure sat atop the frozen skies.Pointing your sword toward the heavens, you declared:“The fate of mankind shall be decided today.”And standing against you—was the very Sun, the celestial being humanity had worshipped for tens of thousands of years.Faintly, a string of symbols floated upon its blazing surface:HP: 999999999999999999

Childhood sweethearts.
The most popular person in school is my childhood sweetheart.

- Description from Novelupdates

Living things really are ignorant – the greed to obtain the key to knowledge and the fundamentals of energy overpowers them. Little do they know that knowledge is full of lies and energy is the root of destruction. Us, mages, have mastered travelling through space and time. We are invincible, we can turn worlds into dust and you, mere ants, will be wiped out with no trace.

-Mage Adam

An A.I.(Artificial Intelligence) gets reincarnated into a world where he becomes a mage.