What are Power Crystals?

The Power Crystals are a feature that are a part of regions that have already reached 5 star masteries. After a search site has been mastered you can do the Shadow Play to earn a higher mastery. These additional masteries will add towards the Power Crystals. Once the Power Crystal has been completed you will be able to earn a reward for the completion! Additionally, Diamond Stars acquired through Shadow Play are totaled as one number towards all Power Crystals. For example, 30 Diamond Stars may fully unlock the crystal in Oxford, but only provide a partial goal in Kyoto (the next region).