Practicing Basic Sorcery for Billions of Times Made Me Invincible - Chapter 171 - Teleportation

Crossing to One Piece world, he became Roger’s younger brother.

Calamity descends upon a a tranquil world in the black of night, transforming it into a death game! This a a true apocalypse, but this is not the end of humanity!

- Description from Novelupdates

Abandoned at birth in a humble stable, Shirone was raised by commoners—but he was anything but ordinary. Blessed with remarkable insight, he taught himself to read at a young age. A fateful visit to the city introduced him to the wonders of magic, igniting an unshakable dream of becoming a mage. Yet, beneath the city's dazzling facade lurked a ruthless social hierarchy, where power and privilege crushed those who dared to rise above their station. As Shirone uncovers the world's darkest secrets before even coming of age, one question remains—can he defy fate and claim his destiny as a mage in a world determined to keep him down?

This is a vast and powerful wizarding world community, where powerful wizards wantonly capture gods, conquer planes, and reshape civilizations.Upon entering this world, Lynn realized that knowledge is power, and power is truth. On the path of seeking truth, he will always remains a humble apprentice.