After a rocky first few seasons, Diablo 4 looks to be turning things around ahead of Season 4 thanks to the introduction of the PTR, or Public Test Realm, which allows players to test builds of the game while they are still in development so that Blizzard can use feedback to make adjustments ahead of release. However, due to an in-development build of Diablo 4 Season 4 existing on the PTR, some players have been able to datamine information about the upcoming season before its official release. As a result, there are some clues that have been uncovered that point towards Diablo 4 Season 4's theme, along with some of the new items and cosmetics.