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Answers
1. Yes. lvl 5 of any expertise is very good. However it works best with the sword.
Never experimented with that. But I guess it should.
3. Special moves cost stamina while magic costs mana.
4. Technically - 'yes'. But for all practical purposes there are a lot of them around. <span class='standouttext'>Spoiler : </span><span class='spoiler'> If you make restoration potions, you won't need that many herbs. You can combine health and mana potions to make restoration potions. </span> (Highlight to read)