After Ten Years of Hiding, How Did I Become a Marine Admiral?

In an era of extreme chaos, with the Four Emperors at odds, Supernovas running rampant, the Navy Headquarters, the Seven Warlords of the Sea, the outside world was simply too dangerous. Klein hid in the naval base, executing criminals every day to receive rewards. Killed a fish-man pirate, obtained a fish-man's inner core! Killed a pirate swordsman, obtained a sword technique visualization diagram! Killed an extremely evil criminal, obtained Killing Intent Fluctuation! Sword intent visualization diagram, meditation, perfect Armament Haki, Observation Haki to predict the future, Killing Intent Fluctuation, cultivated a body that was enough to rival the strongest Conqueror's Haki. Without relying on a Devil Fruit, without relying on any connections, he became the strongest Marine Admiral. Klein: I got to where I am today entirely through my own efforts! Execution Log, charge for me!!! ... ...