Zerkon laughed for a while as he watched Helios' and Aeternus's futile attempts to hurt him. He is not like Zernon and his rules. Zerkon doesn't have any rules whatsoever. He is jovial and also detached from reality.
Then he stopped and said to them, "Don't bother trying anymore. You can not hurt me. You can't even touch me as long as your action can hurt me. The only person that could touch me while trying to hurt me was Zernon. And that's only because he was the Celestial Supreme. Even then, he couldn't kill me. He is dead now and I will become the next Celestial Supreme. So give it up. I don't see any possibility of you ever harming me."
Zerkon is not like his controlling brother who seeks to control the world or like his nephew who is afraid of the world and chose to control a secluded part of the world. Zerkon accepts that bad things happen and they can happen to good people. He believes that anything can happen and trying to prevent it is not the way. So he gave up on the world and in return, disconnected himself from reality.
It is not a total disconnection. He is still connected to the world or no one will be able to see him. The domain of Order protects through resistance while fate protects through non-interference. Zerkon has left things up to fate and chosen to become an observer. His position as an observer has elevated his existence and made him immune to the changes of the world.
He is like a three-dimensional entity watching two-dimensional entities on paper. They can't harm him no matter what they do. Even if the two-dimensional figures manage to come out of the paper as Zernon did when they fought by bending the rules with his law of order, it doesn't change the fact that Zernon is still a two-dimensional figure and as such, there is a limit to what he can do. He was able to touch Zerkon and harm him, but they were insignificant scratches.
All of these come with a rule or weakness. Zerkon must limit his interference with the world as much as possible or the changes of the world will begin to affect him and he will become subject to the same rules as the two-dimensional figures he is looking down upon. That's why he suggested the contract of non-interference to Zernon to pacify him.
If Zernon had persisted in his endeavor to kill him, it would have led to more interactions with the world. In a way, if Zernon had continued to scratch harmlessly at Zerkon, those insignificant scratches will grow stronger over time until Zernon can do real damage. Zerkon chose wisely to pacify him and bid his time. Now he has reaped the fruit of his patience. Zernon is dead and he has the Authority of the Celestial Supreme.
"It is good that you are here to witness my coronation. It would have been terribly lonely since you have killed the other gods." He said to them as he chuckled with mirth.
Then he clapped and said, "It is an honor to have my coronation witnessed by a demon king and a very talented half-celestial. Not many have that privilege so I must give thanks."
Then he put the shining ball into his chest and absorbed it. He began to glow brightly. Light streamed out from the gaps in his armor. His golden skin turned white as power filled him. He began to chuckle again and it soon turned into laughter. His laughter became unhinged the more he laughed.
"I have finally achieved my dream. I have become untouchable. I will live forever. I will be eternal. It is my future. It is my destiny."
He continued to laugh even when he returned to normal. His laughter is the diabolical sound that a villain makes after their plan succeeds. The god of fate's plan worked and he is very happy about it. He didn't speak to them again after he became the new Celestial Supreme. He decided he has places to be so he left them.
He passed through the layers of barriers that Helios placed around him as if they weren't there. Helios and Aeternus shared a look then they left unwillingly. There's nothing they can do to the god of fate. They can only accept that they've been cheated. They can only sulk and scheme.
Helios said to the other two, "The Users of fate are too powerful. We cannot continue like this or we will be manipulated easily."
Aeternus agreed. "Even my entry into the world was orchestrated by him. I don't believe it is by chance."
Their original plan was to use divine life energy from the tree father in Helios' breakthrough to transcendence. Helios would then become a king of law but he won't have any Authority because the Authority of life is not compatible with the divine power in his sun core. The same thing happened to Soverick when he used divine life energy to break through. His stats were abnormal but he didn't get the Authority of Life either.
Celestial Authority didn't matter then to their plan. Helios would take time to comprehend the laws and become a titan. Then he will be strong enough to defend Aeternus when Aeternus enters the divine plane. But the tree father discovered the diary of the demigod that bore Zernon's son when he was searching for the divine weapon. They also discovered Stelios' agenda when the tree father finally acquired enough believers and could produce divine life energy.
The discovery of the diary didn't mean much on its own. But it became extremely significant when they combined it with Helios's knowledge of runes and Stelios' plan. So Legion revised their plan and decided to take Stelios Authority and combine it will the Celestial Authorities of Life and that of Order from Zernon's son. It meant they could cut down on time very quickly and bring Aeternus to the mortal realm sooner than planned.