In an annotation from book one, it is mentioned that The Lord Ruler needed all three magic systems in order to do what he did. I always assumed that it meant his Hemalurgy enhanced his Allomancy. Did Marsh get a double power, or is the Feruchemy-Allomancy combo enough? (a sidebar to this question is whether or not stacking abilities is possible through Hemalurgy).
He used Hemalurgy to pull off his most dramatic effects. Marsh didn’t need them, but it makes things much easier.
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