Well, the best time to dual for me is either at the beginning or level 9. When you dual at level 9 you will get an extra kai, and an extra damage bonus. That kai ability is what is important though. If you dual at level 12-13, then the kensai/mage won't be that good in the beginning of the game. It takes quite a lot of time to get to level 14 as a mage.
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