Hidden Deep Faril — Meg Hendry

A dangerous artifact has been stolen from Stonesrest. Finn and his friends are drawn into the search for the artifact. They don't know what the artifact is capable of, or why a half goblin would be after it. Along the way they discover things about their world they didn't know. Legends that are more than legends. Legends that are terribly real. Hidden Deep Faril is a novella.