It is awesome that we have new events that give us magic stone materials... however, there is a problem. I have Dark Frozen Earth at rank 3, so I get 22 normal time-limited stones for rank 2. Then I get 20 more normal time-limited stones and 50 Potent stones. However, those Potent stones are only good for rank 4 or higher, which I cannot possibly use since my stone is only rank 3, and just go into the bin. Why give a player with a rank 3 stone a reward they can't use?