Chapter 150: Too Late for Regrets
The aperture is a mysterious and enigmatic spherical space located inside the Cultivator's body around the stomach's area. Due to it being ethereal it does not occupy physical space such as an internal organ would. The aperture is endlessly huge, yet at the same time infinitely small. Some call it the Purple Prefecture, some call it the Chinese Pool, Essence Pools, or Purple Residences, however, many know it as the Primeval Sea Aperture.
The appearance of Primeval Sea Aperture only occurs after one reaches the middle-stage of nascent soul realm. This is because the middle-stage of nascent soul realm is the actual transition between core formation realm and nascent soul realm.
The core of the cultivator which they formed during the core formation realm, will disappear once it's been entirely refined, which will only occur once the cultivator breaks through to the middle-stage nascent soul realm.