The reason Lu Chenzhou's Dao grew so swiftly was because the Martial Arts Tree stole the power of a Divine Artifact, something akin to "forcing the seedlings to grow by pulling them up."
His true comprehension, in fact, was still somewhat lacking.
During this period, he ceaselessly practiced fists, tirelessly refined his spear, all in pursuit of this breakthrough opportunity.
Now, on the battlefield of the decisive war, in his clash with Fang Ting, and especially at the moment he witnessed the Fire God Formation, his heart touched wisdom, and in a sudden epiphany, he comprehended the fourth Martial Arts Killing Move of the "Martial King Spear", and his Spear Skill also evolved into a Lower Divine Skill. Taking this as an opportunity, he naturally broke through the final barrier and stepped into the "Seeking Dao" Realm.
