I Got the Xuanyi Technology Panel, Also Known as Xuanyi Fire

Lin Yan lived in seclusion in Changsha Xuanyi Hall, awakened the Xuanyi technology panel, deduced the military technology points to unlock the extraordinary Xuan Vein skills, and used the ancient Xuan Dao veins to integrate modern hard-core material science. Let's see how he used Xuan Veins to break the technological barriers and develop heavy weapons by himself.