From SuitApprehensive6723 on reddit:
"Please help. I play on Xbox one. Launched dark souls, all my characters are gone and replaced by this nightmare. I have not done any item transfers with sketchy accounts or anyone at all. If I launch the character it crashes my game."
@illusorywall
Yeah that is 100% a corrupted save file. Just writes a bunch of garbage code. Here's a loaded save file from a speedrunner that managed to get a credit warp because of save corruption: