I recently finished The Alloy of Law, which was amazing, and i was mildly confused on something. The character Miles can instantly heal himself because he is a twin born, and uses gold for both. this apparently gives him insane healing powers. Now maybe this was explained and i just missed it, but why does having the ability to use gold for allomancy as well make him have insane healing powers? Normally he would have to fill is metalminds for a long time but he never seems to have to do that.