The complete set of doomsday novels with more than four million words can refer to the following suggestions: 1. Doomsday Blade series. The series consisted of five novels with a total of 29 million words. 2. The Complete Collection of Doomsday Fictions series. The series consisted of eight novels with a total of 19 million words. 3. The Complete Zombie-themed Fictions series. The series consisted of five novels with a total of 22 million words. The three novels were all representative works of long apocalyptic novels, and the Doomsday Blade series was the most well-known. Of course, there were many other excellent post-apocalyptic novels that could be searched for and read for more inspiration and enjoyment.