Black beetles not only burrow into the earth, but also seem to be able to gnaw stones.

A black beetle gnaws slowly, but if there are a hundred or a thousand, it will be fast.

It's just that Gu Yunling has probed before, and the place of residence of the black beetle doesn't seem to be connected to the tomb, which also shows that there is a protective layer in the tomb, or that there are ghosts and demons guarding the tomb.

Otherwise, the tomb would have been knocked open by the surrounding fierce beasts, and no matter how bad it was, it would be occupied by black beetles.

......

"Daomen Tianzun: Cultivating Immortals with His Wife" Chapter 303 Test the Dragon's Mouth is hitting in your hand, please wait for a while,

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