The soul Qi ball was constantly releasing energy into the soul Qi space. Lu Ming felt that the amount of soul Qi contained within that ball is far greater than what he expended while lifting them.
"Isn't the quantity too low if it had been storing soul Qi for such a long time?" The Keeper said that the soul Qi supplied by the soul beads were coagulation of all the soul Qi which were utilized by all the previous candidates. The energy present within Lu Ming's soul space was too little when compared to the soul qi expended by the contestants.
"The whole altar seems to be an emperor grade artifact in itself. Although you are the only one who was able to reach the end of the process, the one who placed it here clearly left it for the younger generation. If you could take possession of the whole artifact, you could get all the stored soul Qi it had accumulated over the years. I couldn't begin to comprehend the amount stored for all this time."