Nya's allergy

The Blast from the Past story starts off with Nya having a strange illness, which was assumed to be some sort of allergy. In the second chapter of the first book, Nya went to the doctor's surgery to check it out, revealing she had an allergy to one of the elemental powers, lightning. With this, she was given special and expensive medication to take away the allergy but had to stay away from anyone with that power, aka Jay. This caused quite a bit of drama, especially breaking Jaya up. After searching for days for Jay after he was taken by Nadakhan, they sorted things out and Nya's allergy soon disappeared, having no meaning to the rest of the storyline whatsoever. It has been mentioned since but only briefly.