The Great Demon of the Netherworld is the backbone of the Chaos Faction, roughly at the level of the "Surrendered," approaching the "Crowned."
In short, they bear the imprint of the pillar gods and can serve as vessels for their descent, transcending the thick veil to project their power into the material world, creating enormous impact.
Moreover, because the Surrendered bear the supreme blessings of the pillars, they progress rapidly in both traits and abilities, even receiving certain specified gains or enhancements.
For example, longevity, potential, or even a modification of fate.
Once a noble descendant of the holy bloodline, Greth was a rare "Long-Life Species" among the nine great powers of the Star Sea, possessing a lifespan far surpassing other beings.
This dreamlike beginning was enough to make others envious to madness.
Having more time to pursue what one desires without the need for haste.