Question: must have dlc for crusader kings 2?
Answer: The Old Gods. Finally, we come to that one expansion that is almost universally loved: The Old Gods.
Way of Life. This expansion Crusader Kings II add-on offers the most bang for the buck. ... 
Monks and Mystics. ... 
Holy Fury. ... 
Legacy of Rome. ... 
Charlemagne. ... 
Conclave. ... 
Sons of Abraham. ...