AFAIK, SookmaCook is wrong on two points here. Kensai can dual to mage just fine. It doesn't matter if you have a kit for your first class. Fighter/mage is a legit multiclass combination, so fighter/mage, kensai/mage, berserker/mage and even wizard slayer/mage are all legit combinations for dual-classing.
As for prime requisites, IIRC those have to be 15 for the starting class and 17 for the class you switch to. So in your case, you'd need 15 str (and maybe con as well) and 17 int.
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