The end of the world: My zombies can be synthesized

Story of: The end of the world: My zombies can be synthesized(Updated 20,000 words per day) Traveling to the end of the world where zombies are rampant, Ye Chen discovered that he could synthesize zombies. Not only did the synthesized zombies obey orders 100%, but they could also produce treasure chests every day~Two level 1 zombies are combined into one level 2 zombie, and a level 2 treasure chest +1 is produced every day.Two level 2 zombies are combined into one level 3 zombie, and a level 3 treasure chest +1 is produced every day."Ding, congratulations. You opened the level 5 treasure chest and got all attributes +5, an E-level titanium crystal knife, and power upgrade points +3."Ye Chen: "Oh, can you even synthesize your appearance?"(A new book by an old author, it’s easy to develop apocalyptic writing, it has a harem, it’s non-toxic, it’s not a brainless recommendation...