Then just use the Kerry for the CR and skill up.. The exp with fairy's is like less then 3k I think. Which really isn't alot compared to gold males who give 7k

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Even buying another spica for CR and skill up is better then awakening both barba and Kerry.

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You only wanna awaken units you really can't get better then. Or atleast not without summoning. Kerry and barba are both replaceable. It's not a matter of if it's when.