Larger Map: The steppes of Central Asia are now open for you to conquer or develop.
New rules for nomads: Now distinct from other pagan tribes, the Mongol and Turkic nomads draw strength from open pastures and large populations.
Clan management: Struggle alongside rival clans within your nomadic nation, even launching civil wars to keep your khan on top.
Tributaries: Vassals are often a lot of trouble, so why not simply force a conquered enemy to send you a load of gold every now and then?.
The Silk Road: This great historical trading route linked the Mediterranean and the Far East. Exploit its wealth or pillage its trade posts.
Forts: New temporary structures you can build to hold enemy territory while your army marches onward