The [Profound Void Archery Arts], a first-grade spirit-level technique, can conceal the practitioner in the void when cultivated to an advanced stage, allowing them to kill without a trace.
Only those with a powerful soul and an innate talent for archery could cultivate it to the Realm of Perfection.
This was the archery technique Jiang Ke'er gave to Beigong Yu.
Chapter 160