You Asked Me to Rule in Your Absence, and I Turned Great Qin into Immortal Qin

He transmigrates to the Great Qin Dynasty and becomes the sixth prince, Ying Huan. He only wants to be an idle prince and make a few improvements to the Great Qin Dynasty along the way. Unexpectedly, he activates a trait System and obtains the one-of-a-kind trait Speed Boost (Rainbow) from the start: no upper limit. Best of all, the traits he rolls can also be applied to anything. One mu of farmland [Rapid Growth (Red)]: crops ripen once a day. The effect weakens by one generation with each successive crop. A forging hammer [Cut Through Metal and Jade (Gold)]: weapons forged with it automatically gain the ability to cut through metal and jade. A mare [Long-Distance Charge (Gold)]: her foals automatically gain the ability to charge over long distances. The effect weakens by one generation with each successive foal. A crucible [High Explosive (Purple)]: the gunpowder prepared in it automatically gains a high-explosive effect. Li Si: Crops ripening once a day? This is practically immortal magic! Gai Nie: They say the fastest martial arts are invincible, but you're way too fast! Zhao Gao: One slash, two pieces; two slashes, four pieces. This power is terrifying! Ying Zheng: The weather's getting cold. Bring my son a dragon robe!