Faction failed to load upon loading a saved game. The load menu shows the faction being alive, but doe snot load them. Game ender because it causes immediate crash end of turn. Has something to do with the quest the bard summons a dragon, Dragon Song. Was able to load a game many turns before I did it and the game was fine, played up to the point I summoned it and it happened again. I saved before summoning however summoning that turn I saved changed the the game saved 10 secodns prior to doing so. This infected the two other auto saves to produce the error, even if the game was restarted.
I have copied the save file that contains the error. Email me if you want the save file to debug.