Aka Kun Wu Sand.
A precious material used to improve the toughness of weapons. Kun Wu is often a reference to the legendary ancient sword capable of slicing through jade stone like it was mud. Liberties were taken for the final English translation.
Relic Blade Sand possesses very potent spiritual powers. Generally, only centuries old ancient monuments can turn out Relic Blade Sand. Legend has it that Relic Blade Sand is the highest quality material that can advance weapons to the “One Star” Grade. If a Heavenly Star General wants to upgrade her own weapon, then she will definitely choose Relic Blade Sand.