Now there is only one question left to solve:

Who gave the Targonians a crown that could enslave a being on god-level?

Seriously, the more I think about it the less sense it makes. Their great expansion and rise to power came after they enslaved him by using his power, so how could they reach this level of magical technology before?

And how does it work exactly? How do they manage to destroy random stars whenever he disobeys orders?

There is just one possibility: a powerful entity had been behind this, orchestarating Sol's enslavement from the shadows. One that might be just as powerful as Sol. The "laughing presence" maybe? I mean, the void would like him to be tied down, no doubt on that. But... there is still the possibility of a third party.

And now, what more godly beings do we have apart from Celestials and Voidborn? Simple: . Now, this is wild speculation, but I'm worried how the Darkin fit into this mess... it might as well be a Celestial vs Darkin conflict with the Void threatening both parties equally. Or maybe they are more some kind of "wild card" in the Celestial Vs Void debacle? We clearly lack information on this!