I’m not really understanding what you saying about, account is the email in use.
I think the game all ready knows how many characters has any account.
For me if someone acc has 1 mage 1 Rogue 1 warrior , must be aloud to choose to buy max 1 off any type, not all of them from shop!
For me the limited edition items must be available to buy for all people, not just the one with infinite amount of platinum buy them all.
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