What is the Purple Mansion?
It is the dwelling place of the Immortal Gods.
In the context of cultivation, opening up the Purple Mansion means creating a habitation for the Divine Soul within one's Sea of Consciousness, allowing the otherwise hidden Divine Soul to manifest and have a place to reside.
The Divine Soul is essentially the commanding Immortal God of a person, and its residence is naturally the Purple Mansion.
The Nascent Soul Stage Zhenren can exist in the form of a Nascent Soul even after their physical body is damaged, which indirectly confirms the theory that the Divine Soul is the "Immortal God."
To summarize using the four major stages of cultivation, the Foundation Establishment Cultivator creating the Purple Mansion is akin to moving from the "Refining Essence and Transforming Qi" stage to the "Qi Refining and God Transformation" stage.
