As far as determined to use sponsored magic...I am open. The goal is a npc whose magic is relatively subtle and easy to rationalize that he is doing crazy Asian martial arts. Also that his magic is not in the weight class of an actual wizard.
If you want something less powerful than magic you might try creating a power. Something like this perhaps.
Transcendent Swordsman version 0.2b [-2]
Description: Your skill with a blade is supernatural.
Skills Affected: Conviction, Weapons
Effects:One Blade is Many. A Transcendent Swordsman may split attacks or attack everyone in a zone. (Standard mechanics.)
Mind Controls the Blade. Spending a point of mental stress allows the swordsman to choose a number equal to or less than his Weapons and roll Conviction. If successful they may choose one of the following:
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Perfect Steel. Add the number to your next attack or block.
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Wall of Steel. Subtract the number from the next melee attack targeting him or an ally in the same zone.
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Strength of Steel. Add twice the number to damage against inanimate objects.
I Become the Blade. Spending a point of mental stress allows the swordsman to roll Conviction (4). If successful they may choose one of the following:
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Steel Fury. Take two actions on his next turn as long as at least one is an attack with his sword.
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Steel Mind. Use Weapons to intimidate for a scene.
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Steel Water. Use Weapons to counterspell.
No warranties...that's off the top of my head with no testing.
It's not nearly as flexible as using sponsored magic but still uses the same resource/concept of spending mental energy.