After Shi Lei successfully forged his Formless Golden Core, he immediately circulated his boundless Spiritual Energy and opened the Jade Slip containing the Xuantian Nine Qi Formula.
He had originally intended to study the cultivation manuals within the nameless section further, but he discovered that this Golden Core manual was far more difficult to practice than he had imagined. First, he actually needed to collect seven types of Tier-3 Spiritual Materials, melt them into a medicinal broth, and ingest it before he could even begin practicing.
He had to soak in the "Nine Qi Marrow-Washing Decoction" for seven days and seven nights, allowing the medicinal potency to seep into his Golden Core and unblock the "Nine Orifice Spirit Veins" for success to be achieved.
Chapter 480