other than balancing and improving its 13 spells, and adding 5 extra spells to reach the total of 18

i would like to change the mechanic of the kensei, because it is too much similar to the monk (monk spends charge counters to cast spells, or to cast improved spells in megamod)

for once i would like to be able to cast the improved version of the spells without having to equip mushin spell.

here is the new mechanic: Bushido
when the player doesn't have any status effect, he can cast an empowered version of his spells.

you cast a buff ? your spells will not trigger the extra magical effect
you get hexed by the enemy ? same as above.

about mushin:
it is a status effect, buff type, with a peculiar ability: it does not break Bushido, which means that the kensei can cast this buff type status effect, and still be able to cast the empowered version of his spells.

mushin lasts forever... until the player gains another status effect that is not mushin
the moment the player is hexed by the enemy, mushin buff ends... same when casting mushin spell while the player has at least 1 status effect active that is not mushin...

while mushin is active all damage received is reduced by 2, and all damage dealt is raised by 2 if the damage done is 2+

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1 spell tweaked, 17 to go :D