This is not Solitary Defilement. Not quite sure what it is. But it’s interesting!
SOLO BORG is a standalone 80+ page game and toolkit that allows you to play MӦRK BORG completely on your own. Compatible with the base game and third-party content, it lets you fight for survival in a doomed dark fantasy world—without other players or a Game Master (GM)—while embracing a satisfying minimalist approach that keeps narrative and nastiness at the forefront.