Root Unlock

What is there on the top of the giant tree that stands between heaven and earth? The academy in the sunken land, the Xuanyuan Sword composed of chains, the giant sword with absolute suppressive power, the seeds of the world tree deep in the roots, and the newborn root life form. In this world, those who use their souls as locks to imprison their roots are called locksmiths. The root is the "gift" the world gives to mankind.