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Grandmaster Crystal appears when

Hi friends I want to ask that when does Grandmaster crystal appears in our crystals vault as Shard crystal
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@The_One I have also seen something called Featured Grandmaster Crystals, how does one acquire those?
Same way you get the grandmaster crystals, by becoming uncollected as @The_One explained.
So like let's say you get a GMC every week, every 2 weeks you get a Featured GMC or how does it work?
GMC one every two weeks / bought for units
Feature GMC is on sale, similar to the 4* feature ones you can buy.