Quartet Arms is the name of the weapons weilded by the four legendary heroes: Yuzusuki from Planeptune, Kuterogi from Lastation, Gheytz from Leanbox, and Miamoato from Lowee. In Hyperdimension Neptunia and Hyperdimension Neptunia Re;Birth1 these weapons serve as the keys to open a path that humans may take to Celestia. For that reason, the weapons were disassembled and scattered across their native lands.