Apocalypse: My Players Are on a Killing Spree!

[Apocalyptic schemer + The Fourth Calamity + some of the worldbuilding and settings from Explosive Gun Heroes + no female lead] This is an abandoned city that has suffered constant zombie hordes for years. The protagonist has spent decades steadily building himself up here and has finally managed to become the city lord. He’s about to reach the pinnacle of life when he’s told that in three months, he’ll become someone else’s vassal. How could he put up with that! He immediately pointed at that big, burly underling and wished his parents good health! It was then that the System, delayed by several decades, finally appeared! [Dear user, The Fourth Calamity System has been successfully bound!] [Please name the game, and 10 beta-testing slots will be issued shortly!] What? A System? For no particular reason, Luo Qi gave a crooked grin. Heh, sorry, but I’m not becoming anyone’s vassal!