Look at their walkers. And there is a mention of the exile being on Mars, I think they call themselves iron to make them seem stronger than they are
English
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But why would we call them Iron Walkers and call all of the others Exiles? Those Walkers are probably remnants from another House that was assimilated into the Exiles
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Because, we gave them the title of exile to make them look weak, when really they are the house of iron
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But why would we then call the Walkers Iron and not Exile?