My recommendations

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  ARTICLE 2 An alien crash lands in Equestria. It calls itself human. by Muppetz 228,756 words · 5,174 · 177
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  Dark Conflict An ancient, forgotten evil returns, and Celestia and Luna find themselves forced into a deadly game. by Six Quills 30,875 words · 79 · 5
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  The Thessalonica Legacy by Dashukta 70,129 words · 568 · 18
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  Machine And Might A massive contraption obscures the Equestrian sky. "USS Vector" is engraved on its sides. by Kriegor 130,131 words · 1,975 · 148
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  Falling Stars A cosmic accident has brought two 31st-century mercenary units to Equestria. Any hope for peace is destroyed as greed flares and battle lines are drawn, and the ponies find themselves thrust into the horrors of war. Will they rise to the challenge? by Rokas 265,395 words · 767 · 43