Apocalypse: I Obtained the Myriad Worlds System a Century Later

Dark, no heroine, all heavens, utterly inhuman, kills protagonists, and adds plenty of mayhem. (After surviving a century in the post-apocalyptic world, Ning Chen unexpectedly obtains the All-Heavens Plunder System and transmigrates across worlds to plunder them.) In the world of Attack on Titan, he kills the fakes and wipes out the protagonist group. During a rule-based incident, he kills everyone alive at a school. In The Live-In Son-in-Law, he humiliates the protagonist and murders his entire family... See how Ning Chen dominates the myriad worlds and leaves behind his legend as a god of slaughter.