During the first clash with Elder Celestial Master,
Gu Zhan, relying on his peerless Martial Arts awareness, already understood that the so-called Grotto Heaven is essentially a self-contained world.
Just like the Elder Celestial Master now,
he is standing right in front of Gu Zhan, yet they are not in the same space. Therefore, no matter how powerful Gu Zhan's Divine Techniques are, no matter how terrifying his combat strength is, he cannot even touch Elder Celestial Master.
Mo Jingzhou once told Gu Zhan,
that during his youth, when he visited Elder Celestial Master, he felt an overwhelming fear just standing in front of him, unable to summon the courage to fight. More directly, he felt that in front of Elder Celestial Master, his own strength weakened. However, at that time, Mo Jingzhou didn't understand the reason, only guessing that it might be the aura of a Land Immortal.
But now,
Gu Zhan understood that it was because the Grotto Heaven Cultivator forms his own space.
