The save file location for Darksiders Warmastered Edition on PC depends on the storefront you are using. Below are the common directories for each major platform:
If you are looking for these files to transfer saves from the original edition, the Warmastered Edition typically attempts to detect and transfer them automatically when you first launch the game. Are you looking to your progress or are you trying to manually transfer a save from the original game? Darksiders Warmastered Edition - PCGamingWiki PCGW darksiders warmastered edition save file location