Clear-scaled dragon

Hello! I've been a reader of Eragon in both my native language and the english one for over five years now, and I've started a fanfic. Recently, ive seen a post about the beor mountains and on one of the comments there is a mention of a clear scaled dragon. I don't remember the story, so if anyone does, can you tell it to me in details? I wanna use it for the story I'm writing.