Fire Emblem Three House the tyrant of Fódlan

Ok this is just fanfiction with three kingdoms and total war but really this is what happens if this man controls Fódlan and how he runs so please have fun and really crossover is better. So basically Byleth is my oc and this is how he gets along and how he tricks them.

Dong kyle the warlord who has a dream to make his own thing until his kingdom got a rebellion and he escape. With his great warrior lu bu and zhang Liao on his side. The tyrant escape and found a new land that he can hide until he was now part professor of the church of Seiros and with his greed and persuasion he then became Seiros trusted man. 5 years later war begins and the tyrant has his chance to make himself emperor of foldan.