Hi thanks for the posts on the mod. I didn't realize people actually write feedback on here so I'll come back and check periodically now.

Hades 1.0 broke the mechanisms used for reverting the metaupgrade levels, so I rewrote the process a little bit and now it avoids crashing the game. again if you're having issues, set RollbackAfterRun to true, and take a death, you'll be back to a normal standard darkness rank, and your save should be fixed.

Remember to back up your saves frequently when modding.