I have Been Reincarnated! - 090 – The Shadow’s Magic Tools & The Magic Language

A perfect exercise has created a mythology academy that makes the heavens and the world tremble.

The invincible dean leads a group of teachers and students who are not afraid of the sky and earth to compose a myth together!

When hundreds of millions of years have passed and he is no longer in the world, there is one title that still makes the world tremble: Dean!

- Description from novelbuddy

First World : CampioneCurrent - Second World: High School DxDThird World: ???Reincarnated into the world of Campione! Haru Kasugano, our hero slays gods and ascends as the mightiest Godslayer. He battles powerful God-Kings and Campiones, claiming victory after victory. Whatever it is. [Wealth, Power, Beauty] he has it All. Watch him grow stronger as he travels into new realms like High School DxD and the Fateverse, leaving a trail of defeated gods and captivated hearts in his wake.

Xia Tian traversed from Earth to the grand world of Jiuzhou, an expansive realm of immortal cultivation.There, he became a prince of the final imperial dynasty in this world of martial immortals.As the dynasty teetered on the brink of collapse, and his life hung by a thread, fate granted him another crossing.This time, he traversed into the Supreme Primordial Realm, an unparalleled world of ultimate power.What’s more, he became one of the ten crown princes of the Celestial Demon Court.Later, Xia Tian obtained a strand of Hongmeng Purple Qi—a primordial essence of the highest order. He presented it to Di Jun, the emperor of the demons and his own father.From that moment, the history of the Primordial Realm took an entirely new course…

In the Abyss, all beings are imprisoned, struggling bitterly to survive. One day, in the eternally dark lower world, a young boy has a chance encounter and catches a glimpse of the upper worlds. He is fortunate to witness wonders beyond even the most beautiful dreams. Realizing there are worlds beyond his own, he refuses to settle for mediocrity and vows to ascend to the top step by step.