Great Qin: Sacrifice System: I Grow Stronger by Using Corpses

He transmigrates to the Great Qin and activates the Sacrifice System! Sacrifice Ying Zheng to gain an emperor's physique; sacrifice Zhao Gao to get a loyal version of Zhao Gao. When the Tang, the Eastern Ying, and Western Xia all send princesses to marry into the royal family, how has the Great Qin suddenly become a superpower receiving tribute from every nation?!