If you have the Crusader Kings II you can get this pack of aditional content. With it you'll be granted several contents to your game, such as exclusive Mongol culture units, portrait options for your main characters and the Origina Sound Track that plays through your nomadic campaign.
Mongol Unit Pack: This unit pack adds seven new unit models exclusively for the Mongol culture.
Early Frankish, Early Germanic & Italian Unit Packs: These unit packs that adds unique unit models for early Frankish and early Germanic cultures, as well as units for Italian, Roman and Lombard cultures.
Cuman Portraits Packs: The Cuman Portraits pack adds thousands of unique face combinations for male and female characters of the Cuman culture group.
Songs of the Steppes Music Pack: These songs run while playing ruler among any of the steppe cultures of CKII.