Talk:Game Updates/@comment-25964059-20190117141007/@comment-26201301-20190117172147

I’m fairly certain it represents which rift traits you have unlocked for a particular dragon. So if you have a sonic dragon with a sold gold circle then you could change its trait to any of the 10 available (fire, plant, earth, cold, lightning etc) a partial gold circle indicates that you only have some traits unlocked.