Netherworld: Apocalypse is a novel unrelated to the Total War Universe in a direct way. However, it had some influence on several horror-related concepts of the TWU. It is an underdeveloped sequel to an unfinished novel Netherworld: Portal and a part of previous, dismissed project.
- It is the first novel the author has ever completed. All previous attempts ended prematurely, one of them including early versions of The Island, which since then has become a part of the TWU.
- The reason why the author has dismissed that project is that after some consideration, he decided it is too naive and uninteresting. The novel was printed some time after completion, but it had not developed past the stage that is currently named by him as the alpha version. As such, there are numerous repeats, various mistakes and even a couple of inconsistencies. The author dropped the idea of improving and finishing the Netherworld series in favor of the new one: Total War series.