Arwen didn't really display any power, just she was seen as beautiful and fair (fairest since Luthien, wasn't it?) and an inspiration to Aragorn, and the thought of concering evil, becoming king and so having Elrond allow him to marry Arwen was what kept him strong. Not powerful, just goddess like.
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What a joy to meet! We only wish to catch a fish, so juicy-sweet!
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