Corona

Red Alert 3: Corona is a mod for Command & Conquer: Red Alert 3 developed by the Chinese modding community. It features a fourth faction called the Celestial Empire, which is based on ancient China. As well, the mods adds new units and rebalances gameplay for the existing three factions.

Synopsis
After the Imperial defeat and the death of Emperor Yoshiro at the end of Red Alert 3, Crown Prince Tatsu and a group of loyal Imperial scientists use stolen Soviet blueprints to create their own time machine. The Imperials went back in time to the middle ages and saved Möngke Khan from a fatal cannonball that would have killed him. Tatsu supplied the Mongols with their advanced Imperial technology under the guise of godly powers. The Mongols then go on a rampage across the entirety of Medieval Europe, leaving a path of destruction that Tatsu hopes would prevent the rise of the Allies and the Soviet Union in the future. Having outlived his usefulness, Tatsu erased Möngke Khan from the timeline and destroyed their technology, leaving the now leaderless and overextended Mongol Empire to tear itself apart. Returning to the present, Tatsu was horrified to see that not only the Allies and Soviets still exist, but in an ironic repeat with what happened with Cherdenko, a new fourth world power called the Celestial Empire was created.