Dragons vs Demons and world lore discussion

Right now the world is pretty open sandbox except for the adventure book. dieties, worship and history of the world is open sandbox. As we play I or if someone has an idea of world lore can be discussed here.

Ok the setting is pretty open but speaks of how demons and dragons helped form the world.

I was thinking about this and though you can fight dragons and demons, I am thinking there are greater and lesser variants. The one found on the world are of the lesser variety while the greater are more like deities.
I was thinking of calling the higher dragons , Celestial Dragons but still haven't come up for one for Demons. I know that the game company as they put out more material may fill in blanks but since it is pretty much sandbox now, we can create it together what they have left open.