Actually, thinking about it (with regard to Truesword Stroke, not the mundane stuff), this is too SMALL a bonus, you can get a much better bonus from an Augment if you take a risk (and I can see no way to bump a Passion Spirit-type result with a HP). So yes to it's use with mundane abilities, but probably no with Truesword (Berserk magic with no berserk involved possibly?).
Wulf
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