The First Exchange.

This is not the first time that they are being invaded by demon kings and this won't be the last time. The fight with demons is eternal. They have even fought 5 demon kings working together and they managed to be victorious. Three demon kings working on their own will be a walk in the park. This battle will be done in a few hours at most and they will be able to return to their lives soon.

The metal ball that is the Celestial Supreme tightened as they became closer to Aeternus. It doesn't have a face so tightening the weapons that make up its body is the way for it to prepare itself both in body and mind for the upcoming collision. It was never up for question if they would choose to block Aeternus or not. The Celestial Supreme is their strongest Celestial and he did not become the strongest by giving up ground during a battle.