Demon kings are as powerful as Origin gods except that they don't have true immortality. Demon gods on the other hand are more powerful than normal Origin gods and they also have true immortality. But that isn't good enough for them. They are the equal of origin gods with Supreme laws but they can't match world gods. So demon gods want to become chaotic entities. They want to be feared as world-enders and eldritch beings.
The path to becoming a Chaos entity is very tricky. Demon gods need to evolve to become chaos entities but the assisted evolution of demons ended when they became demon kings. That is the maximum level that their mark of sin can take them. The rank of demon kings should be the last rank for demons but then they force themselves to evolve by fusing with their mark of sin.
The mark of sin is a very powerful item bestowed by the abyss. It is a fragment of the abyss so it contains some of the power of the abyss. That power elevates demon kings to demon gods and grants them control over all the Authority associated with that mark of sin.
But that isn't enough for demon gods. They take it further by trying to exploit the potential and power present within the mark of sin of every demon with their sin. A single mark of sin has enough power to create a demon god. Imagine what the power present within trillions of marks of sin can do. It is the very height of selfishness for them not to only take Authority but to deprive other demons of any power at all.
The presence of a demon god prevents the creation of demon kings with their sin. The presence of a Chaos entity prevents the creation of any demon with their sin. Demons with their mark of sin will stop growing and will stagnate forever while their mark of sin will disappear forever from that abyss of the universe.
It is not a wonder why such powerful beings won't care about the destruction of the abyss. If not for the effect it will have on them, then they wouldn't care about the destruction of the entire realm.
This act of ultimate selfishness is the only way for a demon god to become a Chaos entity. Their mark of sin is the one that usually initiates and controls their evolution but it can't help them anymore since they have fused with it. But that spark of evolution that they have lost is still present within other demons. They just need to siphon it, fuse with it, and finally evolve to a greater state of existence.
It is fortunate for lesser demons that while the way to become a Chaos entity is known, actually becoming one is not easy. If it were easy then lesser demons will be robbed of their potential quickly and completely. Lesser demons have the difficulty of capacity to thank for their continued existence.
It is said that one should be careful not to bite more than one can chew. The same adage works here. Demon gods need the capacity to absorb so much potential from other demons before they can siphon it. They need to become a worthy vessel for all that power so that they will evolve and not explode.
It is a tricky thing to become a chaotic entity because there is no one way to do it. There are various ways to achieve it. It is all about absorbing enough powerful objects to expand their existence and capacity. There is the use of world sparks. It is certain to cause a demon god to evolve but that is out of reach of demon gods. Where are they going to get a world spark?
So they go for the most available option. They try to destroy divine planes and absorb the Authority of the Celestial Supreme. Demon gods use this method to expand their Capacity. They will then evolve after absorbing enough of the Authority of the Celestial Supreme. All the demons with their sin will become doomed then.
It can be 10 or 20 Authority of the Celestial Supreme but it will eventually work. It is what they plan to do. It will just take time since each divine plane can only provide one Authority of the Celestial Supreme. But then a new and much more certain option became available. They can create enough contributions in the era of conquest for the realm lord to assist them in acquiring a world spark.
Demon lords, demon kings, and demon gods all have their personal issues and selfish agendas to deal with. It all involves attacking planes and taking control of planes. They do all of these without the incentives for the era of conquest. But the coming of the era of conquest has put them in overdrive.
So the activity of demons has increased all over the realm. But it is only for their personal benefit. As long as they gain more power, none of them will bother to avert the unfortunate fate of demons after the era of conquest. So the future of demons is set in stone if it were up to them. But then the realm lord came to them with an offer that they cannot refuse. This offer will not only save the demons, but it will grant them so much more.
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Aeternus is currently in his plane. His is the 1969th abyssal plane. It is a flat circular landmass. It is different from the irregular or mostly square shape of the planes in the realm. There are many volcanoes on his plane. Some are erupting while others are simmering down after erupting and preparing to erupt soon. Every mountain is a volcano and none of them are dormant. This is not surprising to find in an abyssal plane.
These active Volcanoes are either currently erupting or preparing to erupt. There is no dormancy in their activity. They all have their tops opened revealing the red-hot lava within them. The sky of the plane is filled with thick black ash clouds that the volcanoes pump into the air while the ground is filled with rivers of lava flowing throughout the plane and falling over the edge of the plane.