Kumii
Hydro Dragon
I wont completely disassociate Gu'huan from the creation of the crystals. Being a deity means she could've granted the Earth Dragons the special ability they have andd by extensions they recognized that and made the crystals.I gotta change a bit around about Cairo's backstory now. Originally, I had it so that he helped orchestrate the deal between the gods and the kingdom to get the crystals, because he had a special relationship with the gods. He basically forced himself into near death experiences to meet with the gods for knowledge purposes, and the gods thought he was a weird but kindhearted and intriguing and said why not since he wants to use it to better his kingdom. Even though they found it odd and amusing, they respected him because he would only do it to himself, never promoted it or even spoke of it to another person so they wouldn't take the risk themselves and used the knowledge for the betterment of the Desert Nation. And because of that connection he ends up meeting with Gu'huan and helping to bring the deal about. He was high up in the kingdom at the time, a trusted advisor to the king and head librarian and archivist (he was the one who created the first grand library, promoting magic and knowledge, which ended up burning down and the kingdom losing a bunch of godly knowledge).
Make her indirectly associated with them