[Slydria]

The way Tarnada is right now pigeonholes you into going Kensei/Evoker with an offhand tome, which just leads to the ridiculous combination of Charge Mind and attack until you trigger the free Vydel.

So I think it would be best if Tarnada's effect was it's own thing that can't get bonuses like Charge Mind but on the flipside counts the Tarnada as a valid casting tool for the Tarnada's spell so you don't need a Tome for the effect to be worthwhile.