Charm Expansion

Characters on free accounts can only have up to two Charms active, while characters on Premium accounts can have up to six. With the Charm Expansion offer you can avoid these limits. Assign all of your unlocked Charms at once! Note, however, that a single creature cannot have more than one Charm active at a time.

But this is not the only advantage. If you have purchased the Charm Expansion Offer for your character, you also get a 25% discount whenever you are removing a Charm from a creature. As a creature can only have one Charm assigned at once and a specific Charm cannot be assigned to more than one creature at a time, this purchase will save you quite some gold pieces in the long run.