During the time spent in seclusion to Breakthrough Sixth, Lu Chenzhou was also contemplating how to evolve the Phoenix Form Fist into a Supreme Divine Skill.
He already had some nascent ideas, which was to merge the Lightning Dao with the Phoenix Form Fist, taking speed to its utmost limits.
Mystic Turtle, reaching the pinnacle in defense.
White Tiger, reaching the pinnacle in slaughter.
Phoenix, reaching the pinnacle in speed.
Grey Dragon, more comprehensive, focusing on constitution healing.
Thus, he could integrate the three paths of Yuji, Power Extreme, and Speed Extreme with the first three symbols, achieving harmonious integration.
However, the creation of a Supreme Divine Skill is not something that can be achieved overnight. Without a fully formed Cultivation Technique, there are inherent risks. He initially didn't intend to use it, but now, to complete the trial, he couldn't care about much else.