They have combined the power of the law of order and the dragon heart of a god beast into Helios. His concept, the Eternal Dominator, is what they get for exchanging Legion-8 and their access to Cosmic energy.
Helios is no longer a star. He is a golden pillar of light now. He is still producing light, but his light is not enough to serve the realm as a sun anymore.
He complained about it, "It seems we will never get back our access to an infinite supply of cosmic energy. I didn't like my time as a star, but cosmic energy more than made up for it."
Legion-5 tried to console him, "It is what it is. We can't eat our cake and have it."
Aeternus stated clearly, "To be clear, we want to eat our cake and have it, but we can't. So we are settling. The cosmic energy that you have collected for over 50,000 years will have to be enough for us. The blood of the dragon king will also have to do for me."