Wugui Kojiro continued his explanation. "When a cultivator reaches one million combat power, a faint Primordial Spirit spark would appear in his Dantian! After that, when his combat power increases by another 500,000, that faint spark would become a Primordial Spirit pyre! This is when the person's combat power is exactly 1.5 million! From then on, every time there is a 500,000 increase in combat power, another pyre would appear! When the number of Primordial Spirit pyres reaches nine, the person would then be at the peak phase of God-Ascension cultivation! After that, when the nine pyres consolidate into one and begin to develop a Primordial Spirit, is when a person breaks through to Primordial Spirit cultivation and become a true Earth God!"
Wugui Kojiro had basically explained the entire concept of God-Ascension cultivation in a nutshell, and his explanation was very clear as well.