This is 3rd most important DLC to pick up for CK2
This DLC gives you a significant advantage when playing. You can borrow 300g from the Jews, then expel them for 200g more. At the start of the game you instantly have 500g.
Bishop/Cardinal mechanics are basicly worthless.
-Biggest problem I have is that the Pope is always perfect, and all your bishop vassals will pay tax to him.
-Pope will give you money regardless if you are kin, given you have Pope decided who the next bishops are (doesn't matter). Leave your councillor bishop improving relations with pope, all game. You will make 5000g easy.
-minor actual control over the Papal state. Dynasty member will give you the same amount as non-dynasty with the same traits.
Religious events are basicly 30gold for 30 piety, and 20% chance of drunkard or 30% +1learning.
Jewish characters could be fun to play, but you can't borrow and expel Jews for 500g... making them weaker then any state in the game with a "modern/reformed" religion