If a member not in the active party has a band they receave 100% exp that the active party is getting. If they don't have the band they only receave 50% of the avaiable exp pool. If you peordered the game you were able to download a voucher that allows you to buy it from any store. If not the only way is to have a party member make it who doesn't show up until much later in the game.
no reason to use on them cuz they only get used on instances where you have to split the party up into multiple groups as they can only be in the second or third party...you have to use a couple of them each time...but most of the main characters fit into those parties
And everyone is leveling because everyone gets experience. It's just that the character who are not in your active party get less. It doesn't stop them from leveling up, but it means they level up slower. Karathos wristband fixes that problem.
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