Every realm has its own rules of heaven and earth.
Under normal circumstances, the highest realm one can cultivate to in the Immortal Realm is the Heavenly Emperor Realm.
Perhaps the Heavenly Emperor Realm can temporarily suppress cultivation to prevent the arrival of the Ascension Thunder Tribulation, but continuing to cultivate in the Immortal Realm will never lead to further advancement.
Only by ascending to the higher dimension of the Divine Realm can one continue to cultivate and grow.
Therefore, when Xia Shiyun noticed that the Demon Sovereign and Demon Emperor's cultivation had surpassed the Heavenly Emperor Realm, she found it unreasonable.
Moreover, if the Demon Sovereign and the Demon Emperor were so powerful, how could they have been entangled with the Matchless Heavenly Emperor for so long, they should have already destroyed the Matchless Heavenly Emperor and the Human Race.
