Here are the major changes (complete list here! ):
- Added a "Depose Antipope" Casus Belli
- Added an "Antiking" faction. The leader usurps the liege's primary title, deposes the antipope and passes papal investiture. The Pope can be called into the resulting war.
- Not possible to set up an antipope within 50 years of one being forcibly deposed
- Fixed bug in Linux where the game became totally unplayable if you ALT+TAB
- Now possible to play in Ironman mode with the ruler designer and mods (but you won't get achievements)
- Significantly reduced the amount of event-spawned troops across the board to better reflect the rebalanced levies
- Fixed crash bug in the Mac launcher
- Fixed religion reformation crash