Deathstars or Wishlings are creatures that feed off wishes before Discord's rule, Wishlings tried to conquer Equestria but the royal sisters wish no harm to them so they just waited for them to stop, but the Wishlings continued to conquer and leaving the royal sisters to have war on them.

After the war was finished and the ponies won, the Wishlings became extinct or so the thoughts of the ponies, because there is one Wishling remained and her name is Glowstar and this is her story how she struggle to her future.

AN: The picture's base is not mine it's from http://ask-flare22.deviantart.com/