"The dragons of Fire, Electricity, and Wind were descended from Illuminus. While the dragons of Ice, Earth, and Water came from his mate Cosmos.
Illuminus is the bringer of justice, while his mate Cosmos practices mercy. They are not among the living, but are the guardians of the ancestors, the protectors of the balance of life."
-The Chronicles of the Guardians, as read from the Chronicler.
Ugh, this is very messy, but its just some quick concept art. My take on what you might call the Celestial Guardians.
See her mate Illuminus here: [link]
I also might change the name Cosmos, as I just realized Final Fantasy Dissidia has a very similar character (not a dragon, but a divine-type being that's female)
Had the idea for a long time, I guess I wasn't thinking too hard about where else I might've heard that name.