At the Foreign Martial Arts Competition, he had seen some Spiritual Practitioners from the Po Suo Country wearing similar bracelets—they called them… Spiritual Artifacts.
The full name is "Spiritual Instrument", as the name suggests, these instruments are often used to protect the mind, and long-term wearing can also strengthen invisible spiritual power.
"If it's real, then this is a good thing."
Spiritual Artifacts are also extremely valuable; they are similar to Divine Weapons and are generally heirlooms, often forged from certain Heavenly Materials and Earthly Treasures, Exotic Beast Skeletons, or even [Spirit Emperor's son] left behind after the death of some Spiritual Practitioners.
Spirit Emperor's son is somewhat akin to a Buddhist high monk's relic.
