Their culture is nomadic, which suggests psychoportation. But they tend towards either illusion or divine spells in the original version, which feels kind of like psychometabolism or metacreativity. I guess I could go for any of those, but psychoportation maybe is a little better. Not sure, what does everyone else think?
Let's stick with psion over psychic warrior, to better fit with the other gem dragons.
If we do make a non-psionic alternative, I think Cleon's spellcasting suggestions should work.
Based on RavinRay's explanation, I think we can drop the fire resistance