ramzez
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I've never heard of what "inflicted strength against magic" means. But based on your description, it sounds interesting.
And can "Strength against magic" be removed with "Dispel Magic"?
"Strength against magic" is a racial skill of a path that reduces magical damage proportionally to the hero's strength (not attack, but strength itself). It seems like it can be removed. Therefore, it's better to apply it after the Necromancer has cast spells. And in general, when playing as a Warrior, it's often better to wait and see what the Mage does, and then react.