Gu Muyun looked coldly at the black shadows ahead. He said nothing, merely formed a hand seal with one hand and touched his brow.
"Buzz!"
A pillar of light rose from the Taixu Yunxiao Palace's formation and shot straight into the heavens. The next moment, an illusory barrier descended, enveloping the entire Taixu Yunxiao Palace.
At the sight of the barrier, the smiles on the faces of the Primordial Demons and Outer Realm Heavenly Demons opposite them faded slightly.
"If you wish to destroy my Taixu Yunxiao Palace, then enter the barrier!"
Gu Muyun's voice resounded in all directions. Every elder within Taixu Yunxiao Palace at the Immortal Platform Realm or above now stood behind Gu Muyun.
Chen Fei watched the descending barrier, and his gaze flickered slightly.
As a Fifteenth Order secret realm, the Star Realm was entirely different from the secret realms Chen Fei had experienced before. The difference was not that this secret realm held more powerful experts, but that a secret realm of this level possessed tremendous resistance against the outside world.
The clearest example was that, in Xuan Yu Realm, even Peak Sovereign Realm experts, such as the being ranked first on the Heavenly Ranking, could no longer tear open the barrier of a Fifteenth Order secret realm through their own strength.
Unlike secret realms of other levels, where many powerful experts could not enter in person but could directly rip open the secret realm barrier. Just like the Veiling Spirit Realm's Barrier, which had been cleaved open with a single sword strike, allowing cultivators to enter the Star Realm through the crack.
In other words, if Sovereign Realm experts from Tianxuan Domain wished to enter a Fifteenth Order Low-grade secret realm like the Star Realm, they could only possess Early Stage Fifteenth Order cultivation.