The divine lords of the sun god live in harmony with one another because of a lack of competition. They also care about their father to a certain extent. It is why they were concerned about their father's absence in recent times despite the unfortunate things happening.
Their father became a Celestial which sealed their fate to be divine lords forever. They were scared for him and worried because of the Celestial Supreme. It is known that he doesn't respond well to ascensions. Then Helios became a traitor to the plane of Zargoth for bringing demons into the plane and helping the hidden god. Helios' betrayal is a very serious matter to them but it is not as serious as when he broke apart the church of Life.
The church of Life is their birthright as children of the sun god. It could have been theirs and it can still be theirs if Stelios is killed. Helios is the last born and he is not even a divine lord yet but he took over their birthright without decorum or caring about them.
Worst of all, their father didn't do anything at all. They know that he can't be active because he is hiding but he could at least answer prayers and show visions to his believers. Stelios did not oppose the change in any way so it made it very easy for Helios to tear their birthright apart.
The divine lords wanted answers and they tried to contact their father but he blocked all communications. They never thought they had anything to fear from Stelios so they would have come running if Stelios had spoken to them and asked them to come to his divine kingdom for a meeting.
Unfortunately for them, things change for the worst when times are hard. Times have never been harder for Stelios than right now. Stelios didn't even bother with a ruse to bring them to his divine kingdom because it would have been a hassle. He couldn't risk trying to subjugate them himself. He had them brought to him bound and easily killable.
To say he is near death will be an understatement. Stelios wishes he died instead of what happened to him. He wouldn't have to suffer if he were dead. Helios and the tree father practically ripped out a huge chunk of him. It was not a neat tear either. He was given a rough, jagged, and massive wound from his encounter with them. That injury also didn't heal. So he has a huge wound that has been bleeding since that incident. He is in so much pain that he wishes Helios had killed him.
The wound can't kill him because he is a Celestial despite the fact that he is missing more than 60% of his body. He could have given up and found a way to die but he has always been tenacious. It is not his way to give up. He took the risk of death just to escape when he was about to be imprisoned forever and turned into fuel for a Stigmata. He can't give up now that he has escaped so he bore with the literal existential pain.
His situation was made worse by the active interest of the Celestial Supreme in trying to kill him. It meant he had to hide away and suffer without being able to find a way to fix himself. Things were so bad that he would have accepted any deal and made any oath for him to get out of his situation. The Celestial Supreme didn't know how bad his situation was so he didn't make any serious demands of him.
He accepted the Celestial Supreme's offer for help and uses it to get his hands on his divine lords. He healed after consuming all 917 of them and all the divinity in his stash. He was finally able to heal his injury but he hasn't recovered his strength. A Celestial power and mind are part of their body. He can't regenerate what was stolen from him because it still exists out there. What Helios took is gone forever unless he gets it back from Helios or he makes a new one.
Getting his power back from Helios is a dream for him. It is not possible for him now or in the nearest future. Even now, he can feel the tether between them as his spilt Celestial power is seeking to make itself whole again. There is a force of attraction between them that will only end when he is whole again. It is like the connection between a Celestial and their half-celestial child except this one is very strong.
The two of them can use the force of attraction to find each other. He can resist the need to be whole for now but it could get worse if Helios comes to the divine plane when he is in a terribly weakened state. That will change if Helios becomes determined to come and get what remains. Helios is very strong so if anything, Stelios runs the risk of losing what he has instead of gaining what he lost.
So he moved to realistic solutions. Recovery might be a tough order but making more Celestial power is possible. For that, he will need faith from his believers which he isn't getting right now since his believers are gradually changing their faith in him to the god of the Church of Life.
He can't begrudge his believers for their choice. It is a smart decision for them. The God of life answers prayers while he hasn't been answering any prayers. He wasn't answering a lot of prayers back when he was hale and hearty but he answered prayers from important Clergymen like Cardinals and his pope. His injury made it impossible for him to answer any prayers or talk to anyone.
It is very difficult to listen to the ramblings of mortals complain about mundane things when your mind feels fractured and clouded in utter pain. He didn't complain to them about his own fractured mind. What could be more important than that? But they will complain to him about every little thing that happens to them.