I need some plot points. The empire controls resources, maybe through a substance like "Era" crystals, which are used to power their tech but also have a hidden truth. The MP4 Crystals from the old world are hidden, and UPD is trying to find them. The main character, perhaps a tech expert named Kael, discovers a cache of MP4 Crystals and learns the truth about the empire's past. The empire's past might have been destroyed by their own technology, which the rulers now try to suppress. Kael joins UPD to expose the empire, using the crystals to broadcast the truth.