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In brightest day, in blackest night,
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No evil shall escape my sight
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Let those who worship evil's might,
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Beware my power... Green Lantern's light! -Green Lantern Oath
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In blackest day, in brightest night,
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Beware your fears made into light
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Let those who try to stop what's right,
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Burn like his power, Sinestro's might! -Sinestro Corps Oath
In fearful day, in raging night,
With strong hearts full, our souls ignite,
When all seems lost in the War of Light,
Look to the stars-- For hope burns bright! -Blue Lantern Corps Oath
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With blood and rage of crimson red,
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Ripped from a corpse so freshly dead,
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Together with our hellish hate,
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We'll burn you all--That is your fate! -Red Lantern Corps Oath
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Tor lorek san, bor nakka mur,
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Natromo faan tornek wot ur,
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Ter lantern ker lo Abin Sur,
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Taan lek lek nok -- Formoorow Sur! -Indigo Tribe Oath
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For hearts long lost and full of fright,
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For those alone in blackest night,
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Accept our ring and join our fight,
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Love conquers all-- With violet light! -Star Sapphires Oath
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The Blackest Night falls from the skies,
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The darkness grows as all light dies,
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We crave your hearts and your demise,
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By my black hand--The dead shall rise! -Black Lantern Corps Oath
Larfleeze doesn't really have one, but I think this would suit Agent Orange perfectly:
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Mine mine mine, mine mine mine mine,
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Mine mine mine mine mine mine mine
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Mine mine mine mine mine mine mine mine,
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Mine mine mi- ooh, shiny!