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Even the six great sanctuaries coveted the secrets within the spiritual realm, but even in ancient times, the number of times the spiritual realm was opened was extremely limited.
Indeed, during the ancient times, there were several martial arts giants who achieved the supreme existence of the Heavenly Human realm. It is said that they were able to reach the pinnacle of martial arts and became revered ancient terrestrial immortals because they entered the spiritual realm in their youth and gained tremendous benefits. They found inheritance and treasures of heaven and earth, which ultimately enabled them to reach the peak of martial arts.