The game just froze and when I restarted my save game was gone. Not only that, the game immediately autosaved on all three slots at the same time. The autosave function really is useless. Why have three slots when they are all used at the same time?
Oh well. I had done pretty much everything apart from the other 6 characters' high-level message if they had one.
And 1 billion Favour didn't do anything, but I guess you knew that already.
It did crash my game, though that's probably a coincidence.