Cultivation

There are countless cultivation systems throughout the outer realm. The only difference between them is most likely after mortal and before supremacy. Although Meng Chuan compressed the core in his dantian at Regis Godfiend realm into a black hole, which in the novel translation is Chaos Hole. The Chaos Hole realm had 5000 years of life span for Meng Chuan, and for Primordial it was 100,000. It is much greater than normal cultivators. For instance, as I remember, supremacies only have 1000 years of life span while Imperial Lords have 10,000. The godfiend quintessential essence cultivation system is flawed at the very end when one tries to reach Body Tribulation Eminence. The flaw is that nigh impossible perfect one's body unless they cultivated Samsara godfiend body. While this is the case for the quintessential essence cultivation system, other systems throughout the outer realm have perfected systems. For something close to a real example, this doesn't exist in the demon's cultivation system, so they produced much more Imperial Lords and Tribulation Eminences throughout millions of years. Although millions of years has passed, it ultimately cuts short when compared to the demon's world. It has existed far longer so the cultivation system has no flaw like that of Archean eon realm's.

The ultimate reason why there were so few Essence Soul Tribulation Eminence is that it is much harder to cultivate one's essence soul. There have two Third Essence Soul Tribulation Eminences while there was only one Body Tribulation eminence, who is the ancestral master Archean.

Quintessential Energy
After Meng Chuan gained Chaos Hole body, his life expectancy was much higher than a normal cultivator who went through Creation and Imperial Lord.

There are three types of Tribulation Eminence experts:
 * 1) Body Cultivation
 * 2) Essence Soul
 * 3) Dual Cultivation

The Tribulation Eminence stage is  divided into 9 levels with level 1 being the lowest and level 9 the highest. Every Star River System has at least one level 5 Tribulation Eminence expert while every Star region has a level 6 expert. Experts at level 7 are really rare and level 8 experts are nearly impossible to meet. Even meeting a level 7 Tribulation Eminence might not happen for most cultivators in their lifetime. After reaching Tribulation Eminence level 8 the practitioner is able to cross between different universes and travel to the future and past they are nearly immortal with a lifespan of billions of years.

Technique
Dao is further improved beyond Heaven-Earth. They are called Tribulation Law. Usually, 3 Fifth Tribulation Laws are unified to become a Sixth Tribulation Law.