Summons in Final Fantasy 7 Rebirth offer much more than a simple one-off battle to obtain their respective materia. To take advantage of the new open regions, each summon now has its own summon crystals that you need to find as you explore the map. Finding these hidden collectibles is worth your time, so here's everything you need to know about summon crystals in Final Fantasy 7 Rebirth.
Summon crystals are stones littered throughout the world that contain information on the deities and creatures you summon. Each summon presides over a specific region of the world, and that's where you can find their three corresponding summon crystals.
What Do Summon Crystals Do?
You still need to defeat a summon inside Chadley's combat simulator to obtain its summon materia, but the combat simulator battles in Final Fantasy 7 Rebirth are extremely tough. Finding all three summon crystals for a specific summon will lower the difficulty of their simulated fight to give you a better chance at earning the materia reward.