One of the mottos is "Become Legend"
....that doesn't make any sense.
Shouldn't it be "Become a legend"? Or "Become Legendary?"
You can't "Become Legend"
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You can become legend. To say something "is legend" is to say that it has gained a legendary status. You could say, "This story is legend." And if a story "is legend", that means at one point it could "become legend". Destiny is telling you to become legend. It works.