Fantasy: My System Can Be Upgraded

[Traditional fantasy + system flow + single female protagonist] Lu Chen holds the Green Underworld Sword across the sky, and Luo Qingyu holds the Moon Soul Jade to control the underworld. From the small border town to the battlefield of all realms, this pair of Taoists made all enemies understand—— The innate Tao body blessed by the system, and the Netherworld Emperor's blood that unlocked the seal, They are the most terrifying combination in the world!