Dark Artifacts Crystals...

How long after the close of dungeons on June 6th will they be available for purchase? Will we see another rotation? Or have a chance at the other three crystals not in the current rotation?
Thanks!
Thanks!
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Dr. Zola
I'm so close to buy another 5* crystal but I'm afraid this round will be last so I'm thinking about spending them on 4* if anyone knows please help me out. And if there gonna be another round for how long will it last ? Thanks