Blasphemous Save File
Though rare, Blasphemous updates have historically caused save file incompatibility. Having a backup prevents a complete reset of your pilgrimage.
There is perhaps nothing more disheartening than booting up the game, ready to challenge the final boss, only to find your save slot empty. PC players are strongly encouraged to utilize the "Steam Cloud" feature. Steam automatically uploads your save files to its servers. To check if this is enabled: blasphemous save file
~/.config/unity3d/TheGameKitchen/Blasphemous/Savegames/ / (For Steam Deck users, if the native version isn't syncing, forcing the latest Proton version in properties can sometimes trigger a cloud sync.) Save File Structure and Naming ready to challenge the final boss