A note on Hexer's Conversion:
Hexer's Conversion
The user will recover 0.25% HP per point of debuff and 1 + 2% MP per point of
debuff. Of course, the recovery is reduced by a third for Hina.
If this is correct and a point of debuff is the same as "1% debuff", well...
Edit: The reason behind my post is simple. If this is true, then a single -50% debuff would restore 100% MP... I somehow think that a "point of debuff" means something else MP-wise. HP-wise, it's a bit less broken, since the same debuff would restore 12.5% HP(which is a bit more than the 10% HP regen from the Regeneration skill), which doesn't sound broken until you realize that one can have two of these debuffs easily from some of the buff spells that exists in the game(Kimontoukou and Whiskers are two notable examples, with the latter being able to target any ally, rather than just the user), which means a 25% HP regen. Of course, said regen would degrade due to the debuffs degrading, so it's more like a 15% to 20% HP regen at first. Still, a near complete restore of MP after a single cast of Whiskers with Hexer's Conversion is rather OP, isn't it?
I would want to think that a "point of debuff" means "for each separate debuff", but then there would be no need to weaken its effect for Hina, as the max for five debuffs would be 1.25% HP and 1+ 10% MP regen. What I think is needed is a clarification as to what a "point of debuff" actually means in game terms. I would ask Ethan myself, but I don't know his e-mail address and as he himself have stated, PMing him is not the best of ideas for a prompt reply.