Mongol-Indian landmass

Magically, the Mongols and Indians unite to form biggest empire yet. Under couple of lucky shots between Mongols and Indians they unite to form empire that includes much of the Asia continent! Here's what I think of adding such an crazy idea. The government is an dual dynasty ruled by Indians and Mongolians, others are provinces that can't decide as much power. The government is big as Mongol Empire height and British Raj, this includes the land that Mongol Empire try to take but couldn't. Which was Central Europe, more of Middle East, Indochina and Japan. This make them one of biggest governments in the world. Most of world are under strict control by Indians and Mongolian class. The empire is an feudalistic authoritarian society.