Quote Originally Posted by ByzantineKnight
Question: is excommunication a factor in M2TW? (as opposed to a minor annoyance)
Not got excommunicated myself so don't know. However potentially, if you get excommunicated, then your regions are then potential targets for crusades. You can do the same to other factions as well. I was particularly evil when one of my allies was excommunicated. I used the opportunity to try and call a crusade down on them so I could see if another faction would weaken some of its own armies. I would then move in and grab a region or two off the crusading faction.

Didn't work though, pope didn't particularly like me at the time and ignored my request