The power is so powerful that people from outside can't see inside the cave through the prohibition. It is mainly used to protect Mu Chenfeng's cultivation from being disturbed by others when Mu Huan is away.

It is forbidden to block outside, but not to block inside. Mu Huan can even see the cave through the prohibition...

"Fast Wear: Lady Luck, Handsome! Chapter 489 Picking Up a Senior Brother to Cultivate Immortals 19 is hitting in your hand, please wait a moment,

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