In this great war, Jack Clark served as the main force, with both his time clones entering the Dark Star Apocalypse Form to fiercely confront three Demon Gods, including a Lord of the Empire.
Although the battle didn't last long, the consumption was enormous due to the opponent's endless strength from deep within the Demon Domain.
The ancient avatar had consumed about one-third of its power, while Jack Clark, utilizing the divine power of Time Reincarnation, absorbed the power of time a bit slowly.
In just a few days, he couldn't recover even one-tenth of what the ancient seal had consumed.
Rather than this, it would be better to shatter the now damaged, power-depleted Heavenly King Seal and extract all the power of time to replenish the ancient seal to prepare for the upcoming great war.
Of course, another reason was that after Jack Clark's breakthrough to the Ancient Realm, his Time True Body, which had been condensed at the Heavenly King Realm, could no longer keep up.