There are ten separate metals or alloys that people can use to fuel their powers, where I'm from. Most people aren't able to use any of these materials, but for those who do have the power, it's almost always the case that can only use one. For example - pewter for increased strength, or brass to lessen other people's emotions. When someone uses the term Mistborn, it means they can use each of the ten metals, not just one.
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[pauses to decide the best way to explain this]
There are ten separate metals or alloys that people can use to fuel their powers, where I'm from. Most people aren't able to use any of these materials, but for those who do have the power, it's almost always the case that can only use one. For example - pewter for increased strength, or brass to lessen other people's emotions. When someone uses the term Mistborn, it means they can use each of the ten metals, not just one.