Ren travels through the world of pirates, and is demoted to Impel Down City as a guard for offending the Celestial Dragons. The dark and damp underground prison, the vicious pirates, and death are everywhere.
Ren awakened the "Absolute Imprisonment System". As long as he imprisoned criminals, he could obtain attribute points based on their bounties every day. Imprisoned pirates with bounties worth over 100 million, gained strength +10, armed color Haki experience +100, imprisoned the Shichibukai, and the three-color Haki was directly upgraded. In order to become stronger, Renn transformed into the most terrifying evil navy in history.
Not convinced? Break your legs and lock him in! Are the Celestial Dragons arrogant? Just throw it into the sixth floor as an experience pack! When the war broke out on top and the Whitebeard Pirates attacked Marinevando, Ren crushed the execution platform with his foot and said, "Since we are here, let's all enter my impel city!"