This was why Zhao Yun could detect the aura of the Divine Stone Core; after all, a fragment of the Divine Stone Core was sealed within Zhao Yun's Inner Qi Core. But speaking of which, Zhao Yun figured that Lyu Bu must have accidentally swallowed the Divine Stone Core. Otherwise, it would have been impossible for him to be so powerful.
Zhao Yun knew his own circumstances well. In his previous six reworkings, the first three attempts at Inner Qi Manifestation had not reached perfection, causing the Qi stored within to collapse, necessitating direct reworking.
It was not until the fourth and fifth attempts, when he achieved perfection in Inner Qi Manifestation, that he couldn't resist the pressure from the core and had to rework again. His sixth reworking took place after the great battle under Hulao Pass, where he had many insights, and then he achieved the Ultimate Inner Qi Manifestation on Mount Tai before he reworked.