PS: Update done.
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It's human nature to bully the weak and fear the strong.
Lu Xuanji is like this.
The Ten Great Sects are also like this. If they were truly brainless to the extreme, being domineering and unreasonable with everyone they encountered, they would have been annihilated long ago. But in reality, they are tyrannical and arrogant towards some Loose Cultivators and small forces with no background; yet extremely cautious when confronting Immortals with significant backing from the Upper Realm.
Towards Secret Realms or Grotto Heavens opened by some Immortals, they often adopt an extremely cautious attitude.
