The Stardust Scholar was the holiday Familiar for the 2015 Starfall Celebration. Each festival is connected to a particular Dragon Flight. This one celebrates the Arcane flight. The 2015 Starfall Celebration took place during the last full week of September of 2015.
The special holiday items that were part of this festival could only be obtained with the Magical Shard currency. Players can obtain it as a random drop from Gathering or the Coliseum. It is also possible to craft some. If all else fails, use some of your Treasure to purchase Magical Shard currency from the Auction House.
This year, I was able to obtain three out of the four special items from the Starfall Celebration. All of the artwork in this post is copyright of Flight Rising.