Nine Heavens Sword Demon.

Summary

Nie Feng and Yan Huang discuss the understanding of laws within a soul, leading to Yan Huang using the "Seal of the Soul" to compress and capture a powerful soul into a jade bottle. After sealing it, they realize that Nie Feng's little world has merged with another abandoned little world, causing significant changes. The Kaitian Axe, previously dormant, awakens and begins absorbing spiritual energy within Nie Feng's little world, raising concerns about its potential danger. However, Yan Huang reassures Nie Feng of the axe's benign nature. They discover a Spirit Suppressing Jade, which can capture spirit beasts if their true names are known, prompting Nie Feng to cultivate within his transformed little world.

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