Lapis Lazuli and the Metal Shards

(AU. Partially OC-Centric) Lapis Lazuli was found by humanity first, and was later freed by one of them. Her next step is clear, at least to her. Get back home. The task, however, is easier said than done, as now she deals with something that is more dangerous than any monster, regardless of where she stands; The Metal Shards... humanity's shield and sword.