After advancing from the Golden Core stage to the Late Nascent Soul Stage, the most significant change was that the Golden Core had transformed into a Nascent Soul.
The Nascent Soul is an energy entity possessing higher spirituality and intelligence. Equivalent to another self of the Cultivator, it can exist independently of the physical body.
This transformation process is not a simple morphological change, but is accompanied by a deep-level metamorphosis of spiritual power.
Chapter 521