The God of Magic: Archmage Academy (OP, LitRPG)

He spent his days hunting down powerful opponents. When he ran out, the only choice was to look to the future. Literally. Sen Locke was a magic prodigy ahead of his time. He slew gods, saved the world, and became known as the God of Magic. But in a System fueled by the collective strength of all that partake in it, even his advancement had limits. In pursuit of stronger opponents and a System capable of supporting his growth, he traveled to the future. When a time-altering artifact is pushed to its limits, his notes are scattered across time, and knowledge best kept secret is let loose in the world. Now, he faces the ruins of a kingdom he once helped build, and low-level magicians using spells considered overpowered in his own time. Armed with a special new class and the desire to catch up to the god-class magicians of today, he’ll push himself to see just how far the System has come. Starting with the world’s top-ranked magic academy. What to Expect: A Complete Story: Book one of the God of Magic is fully written. That means no hiatus, no pointless chapters, and a book written with its ending in mind. You can also read this story on Royalroad and Patreon! — Description from novelcodex.org