So, I set some time aside today in order to catch up with the Dark Night Metal series this morning. As I was reading "Batman: The Murder Machine" I immediately notice that the introduction on the first page says that we are on Earth-0 "Frist world of the Multiverse" as I continue to read I began to feel like the Dark Nights and Dark Days seires takes place on a different earth than the one we are used to seeing the main story cannon "IE- Action Comics, Detective comics and so forth." In Grant Morrison's Multiversity guidebook: Maps and Legends, Grant Morrison describes Earth-0 as a world that has been through many strives, and Earth-1 as a newly formed earth where the timeline is not set and anything is possible. By these definitions, one would assume that Earth-0 is Pre-52 while Earth-1 is New-52 and beyond. That would make our main story cannon based on Earth-1. However, as i stated previously that the Metal series is taking place on Earth-0. Would anyone be able to confirm which planet the man story cannon takes place on?