You can't dual to kit's, dua to certain...restrictions you have to have the kit as the primary class so you can start as a Kensai and dual to a thief,and you can't mix two kits.
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Hesperex Freth: 1st son of Matron Mother Shi'nayne Freth, 1st house of Ched'Nesad. Weapon master and patron of house Freth.