Luma, a young tinkerer, stumbles upon the Starforge Key in the ruins outside Soluna. As he touches the key, a vision of the Celestial Nexus crumbling apart floods his mind. The world begins to collapse as floating islands drift aimlessly, ancient ruins glow ominously, and shadowy creatures emerge from the darkness. Guided by Zephyr, his talking firefly companion, Luma sets out on a quest to restore balance to the world.