Arkenstone came up to my mind, but it has no "brothers" as far as I know.
wait... Orcrist? But no, I guess if you gave us one more little hint, it'd be fine 
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"Should the story say 'he ate bread,' the dramatic producer can only show 'a piece of bread' according to his taste or fancy, but the hearer of the story will think of bread in general and picture it in some form of his own." -On Fairy-Stories
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