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This secret technique was quite popular back then, as all the Grand Cultivators knew that the Cave Heaven Blessed Lands were merely drinking poison to quench one's thirst, failing to solve the fundamental issue.
Let alone Cave Heaven Blessed Lands, even the Immortal Realm Buddha Land would eventually need to be unsealed, otherwise it would be stricken by heavenly condemnation.
Once the Immortal Realm Buddha Land was unsealed, the Heavenly Earth Prime Spirit was sure to recover, and the era of cultivation prosperity from the Ancient Times would reappear in the human world.
This was the expectation of all Cultivators, but clearly not all could afford to wait. Who knew when the Immortal Realm Buddha Land would be unsealed? All below the Tribulation Realm had a lifespan limit, and even Mahayana could not withstand the wear and tear of tens of thousands of years.