TCF Part 2 Crackpot Theory
!!SPOILER!! WARNING!! TCF PART 2 !!SPOILER!! WARNING!!
!!SPOILER!! WARNING!! TCF PART 2 !!SPOILER!! WARNING!!
Before TCF returns, I would like to present my crackpot and highly delulu theory. Enjoy!
The Demon God. An existence which the demons of the Demon Realm longingly await for. Who had been sealed because of his ability to "kill" gods, mainly the arrogant ones.
So far, the "Demon God" has an ability to amplify powers much like Joo Ho-Shik's "Faith" ability. The amped up power takes on a grayish-color much like the aura and mana used by demons. However, he is not a "Demon" God and I am reluctant to believe if he even is a "God," especially considering how limited a god is outside their main domain/sovereignty (God of Death is strong in death but limited else where).
Furthermore, it is only until recently did the God of Chaos and the Hunters figure out a way to "kill" a god. So, someone from an era before the current events of TCF Part 2 couldn't possibly have such power, right? Well, I think it's possible.
See, I think the "Demon God" is the very first "White Star" and the first transcendent. Yes, very delulu on my part, but bear with me.
Why is the creation of the White Star called the 'White Star Project?' From the Ancient White Star to the Fake White Star, the Hunters directly or indirectly supported their pursuit of 'godhood'; possibly aware of what could happen if successful.
That end result might be a transcendent being. Unlike gods, a transcendent isn't bound or limited to a specific domain and are truly free. Moreover, it is even harder to become a transcendent than it is to become a god.
Just like the Special Abilities in Earth 1 and 2, I believe a god can only harbor similar corresponding attributes (Imagine God of Death possessing only death/darkness-attribute powers). Given how important the balance of natural attributes is in the series and the trials imposed by Ancient Powers prior to inheriting them, it is no wonder that only a few—Ancient White Star, Cale Henituse, Fake White Star—individuals managed to possess all 5 natural attributes.
Now, moving on to the Sky Attribute Power. What we know so far is limited. Aside from being an incredibly powerful attribute, the Sky Attribute Power originated from the Demon Realm or at least has ties with the demon race. Of course, there is also the fact that it requires dead mana/black despair to use. Despite that, I will propose a different idea.
We know that an Ancient Power can be inherited through an improper manner as is the case with the would-be elf who contracted a fire elemental and received the Fire of Destruction (FoD). Because of the improper manner the FoD was inherited and likely due to the non-materialistic nature of elves, the power of FoD was greatly diminished into nothing more than a lighter.
That could possibly be the case for the Sky Attribute Power as well. However, instead of greatly diminished power, it became uncontrollable and wild. The Fake White Star had to regularly bathe in dead mana/black despair just so that the Sky Attribute wouldn't destroy his body. As for the Ancient White Star, I believe that he was in a similar situation to the Fake White Star. Otherwise, there would be no need to collude with black mages and gather massive amounts of dead mana/black despair. This is considering the fact that the Ancient White Star was balanced and had all 5 natural attributes in addition to the Sky Attribute Power.
Hmm... what else? Oh, right! The Wood Attribute! The Ancient White Star's Wood Attribute is not mentioned and completely unknown. The Wood Attribute that the Fake White Star has belonged to Drew/Jour Thames—Cale's mother. It's very likely that the Wood Attribute Power of the Ancient White Star was simply never found. Throughout the 1,000 years that the Fake White Star had been alive, he had only found 1 Wood Attribute user. This would make the Wood Attribute Power the second rarest Ancient Power after the Earth Attribute.
That being said, from the time Cale collected his 2nd to 7th Ancient Power (Heart, Wind, Aura, Fire, Earth, and Water), the Ancient Powers could tell each other apart because they knew each other. This quirk of the Ancient Powers also played a role in identifying the Fake White Star's own powers except for the Wood Attribute Power which had no visual cue.
Aside from that, the Ancient Powers are very sensitive to powers of the same attributes or items bearing similar attributes. And given the tendecies of Ancient Powers residing in specific locations or items, it is possible that the wooden staff carried by the Demon Priestess Timorang is an item bearing the Ancient Power of the "Demon God." This power could be the reason for the gray trees that protects the ruins of the Demon God and the likely power used to amp Cale's Sky-Eating Water (SEW).
Remember that the Ancient White Star's Ancient Powers are opposites of Cale's Ancient Powers. If the Indestructible Shield can 'assimilate/eat' energy and Ancient Powers [e. g. Vitality of the Heart (VoH)] to strengthen itself then the supposed Wood Attribute of the Ancient White Star would be to amplify other Ancient Powers. When the Indestructible Shield ate the VoH, the red heart tattoo on Cale's chest became a silver-colored tattoo like the Indestructible Shield. Something similar happened with the SEW, but instead of being assimilated, it was amplified by 4x its original strength and turned into gray-colored water.
Of course, Ancient Powers aren't just one-trick ponies. They have several other abilities aside from their main abilities so the amplification effect might just be one aspect of the "Demon God's" Wood Attribute Power.
Finally, the First Emperor wanted to know if the "Demon God" actually existed. Because if the "Demon God" existed, he would have been the first god to 'disappear.' But, the "Demon God" himself disproves of his existence as the "Demon God" because that is what the gods of the Celestial Realm called him. In truth, he is a "God Killer."
The reason he even woke up in the first place was because of Cale's potential in god-killing. Mind you that this was during Cale's clash with the Third Emperor—a god-like existence. So, the "Demon God" likely sensed SEW's potential to kill a god. Heck, the Sky Attribute Power that the Fake White Star had used throughout Part 1 might not even be at its fullest potential.
The Sky-Eating Water had to come into realization just to be able to permeate the sky and pierce through a god's divinity with its existence while the Sky Attribute could... Well... It's the Sky Attribute; it controls the sky. For whatever we know, the full potential of the Sky Attribute might even extend beyond the sky and into the stars. Maybe that's the reason why it's called the 'White Star Project.' It's the name of the Sky Attribute and its potential to control the very stars themselves. I mean the stars are almost always associated with endless possibilities. The gods live in the Celestial Realm and someone with the power of 'endless possibilities' would be a massive threat to them, given their limited powers outside their domain. Also, the name of 'Celestial' Realm is already a dead giveaway that if someone possessed the power to command the stars then gods would be royally screwed.
With all that said and done, if the "Demon God's" words of being a "God Killer" is to be believed, then he was likely the first person to have possessed all 5 natural attributes in addition to the Sky Attribute and that would possibly make him the very first transcendent. The pact for restrainting the Mortal Realm from ever developing Unique Powers might have been kickstarted by him killing a god and making them disappear permanently. The inverse might also be possible wherein the "Demon God" tried to kill the arrogant gods for making the restraining pact and succeeded which made them seal him away.
The mission that the God of Justice assigned the First Wanderer might be related to him. And now, Cale is in a position to learn more "unnecassary" information from the God Killer himself and they might finally do something with the White Star's Ancient Powers. But, who knows. We'll see soon enough.