Skyshards are a currency that is used to upgrade Cards, speed up opening of Chests, and purchasing of super awesome Shop Chests, which give much more loot than your regular chests.
You can get more Skyshards by playing the game - surviving in the Arena will give you some Skyshards, while opening Chests will provide an additional source of this beautiful and super useful purple stuff.
Or, if you like, you can purchase Skyshards from the Shop, and go on a shopping spree that has (probably) never been seen before!
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