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@grimlockdown
Accessories seems to be mostly useless but are they very expensive to upgrade!
To upgrade a legendary accessory from grade 2 to grade 3 will cost 15 legendary (yellow) crystals AND 600,000 coins! Upgrade to grade 2 will cost 10 legendary crystals and 400,000 coins. For an epic accessory the figures are 15 epic (purple) crystals and 180,000 coins and 10 epic crystals and 120,000 coins.