Great Qin: I Am a Tyrant, Conquering All Through the Ages

Summoning + dynastic conquest + System

When he opens his eyes, Emperor Qin discovers he has become the ruler of a weak Great Qin. At home, treacherous ministers wreak havoc at court; abroad, powerful dynasties eye his lands hungrily. Fortunately, he has the strongest Emperor Support System, which lets him summon immortals and demons, as well as entire armies. He roots out internal threats, repels foreign enemies, and marches ever further along the road to supremacy. (The blurb is lacking; please head to the main story.)