Gu Master

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## Chapter Appearances

### Introduced

ch. 1

Those with no cultivation talent are bound to stay as mortals, the lowest level in the society, who could be trampled upon and toyed with but those who have the talent to cultivate can become Gu Masters, going beyond the ordinary. A Gu Master is someone who has opened their mortal aperture within their body, can use primeval essence to manipulate Gu and use their wondrous abilities.

Gu Masters cultivate their chosen path, research, innovate, and create new Gu which makes them stronger, better and more adapt for future cultivation and their pursuit to understand the Great Dao, through all those acts of using Gu. Not only (variant-) humans but also beasts can open their aperture and cultivate. Beast Gu Masters that have the wisdom of a human are most often superior compared to human Gu Masters of the same rank, due to their more resilient bodies, high vitality, regenerative abilities, better vision and hearing, greater physical prowess, and longer lifespan.

### Aperture

The aperture is a mysterious and enigmatic spherical space located inside the Gu Master’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. Before becoming a Gu Master the mortal has to awaken their aperture, aside from some special methods, this is mostly done so by coming into contact with Hope Gu.

The aperture has three specialized uses for its Gu Master which are:

1. Producing and storing primeval essence depending on the Gu Master’s aptitude and rank.
2. Serving as the foundation of a Gu Master's cultivation and the basis to promote their cultivation with the help of primeval essence.
3. Serving as a place for a Gu Master to put and safely store their Gu.

**Side Note**

The aperture has a certain capacity towards the number and rank of the Gu stored inside it and can start to get overly burdened this may create cracks on the aperture's walls, in the worst-case scenario causing the aperture to burst and killing the Gu Master in the process. The higher the number of Gu inside the aperture the greater the pressure exerted on the aperture, this also applies to the rank of the stored Gu due to which the pressure also increases the higher the rank of the Gu. An extreme example is the storing of an Immortal Gu inside a mortal aperture, if the Immortal Gu is not severely weakened or otherwise tampered with then it will cause the aperture to burst and immediately kill the Gu Master.

### Aperture Walls

The aperture possesses walls that separate its inside from the outside. Those walls also serve as a primary factor in the cultivation of mortal Gu Masters where they have to be repeatedly nourished, broken down and are replaced by the walls of the next minor realm. The cultivation ranks are divided into five ranks or great realms, and each great realm is further divided into four minor realms, initial stage, middle stage, upper stage, and peak stage. Every minor realm possesses different aperture walls:

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#### Special Aperture Walls

There are methods and Gu that can cause the aperture walls to undergo a significant transformation which also influences their Gu Master's ability to advance their cultivation.

* Dead aperture walls are caused by permanently turning into a zombie. Their walls look like grey rocks.
* Stone aperture walls are caused by using the Stone Aperture Gu. The walls are thickened several times and changed into a heavy, sturdy stone. (Not to be mistaken for the stone membrane aperture walls during upper stage)

### Grades of Aptitude/Talent

    Not everyone has the natural talent to become a Gu Master and even if they become one, their talent can vary greatly as much as having twins of which one has A grade talent while the other has C grade talent. Generally speaking, it is not bad if 5 out of 10 people have the talent to become a Gu Master. For example, in the Gu Yue Clan, this ratio is higher, reaching 6 people this is due to the early action of the Gu Yue Clan’s ancestor purifying his, and his descendants' bloodline.

Primarily a person's talent is what determines which rank they will be able to reach as a Gu Master. The most common knowledge among Gu Masters is that there are only four talent grades corresponding to the maximum capacity of primeval essence being stored inside the aperture. They range from A grade (best), B grade, C grade, to D grade (worst). It is to be noted that the rank a Gu Master can achieve is not exclusive to their aptitude, for example, even a Gu Master with C grade aptitude can potentially become a rank 5 Gu Master and even a Gu Immortal.

There are methods and Gu that can permanently increase the aptitude after opening the aperture such as Blood Skull Gu and Polished Gold Gu. There are also methods to permanently decrease the aptitude of a Gu Master, for example, when the Gu Master receives a heavy injury or impurities inside their aperture remain for an extended period of time, due to methods or Gu such as receiving foreign primeval essence or after using Man-Beast Life Burial Gu.

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## Trivia

* The term Gu Master applies to both mortal Gu Masters and Gu Immortals, but is more often than not, used to address mortal Gu Masters.