Pandora's box contains the 7 deadliest sins: Wrath, Gluttony, Greed, Envy, Sloth, Pride and Lust. They were all accidentally opened by the alicorn Pandora Star. Celestia gave Pandora a box to watch over, though Pandora did not know why even though she asked Celestia. Pandora then asked her why she didn't give this box to Twilight. Celestia didn't want to put more things into Twilight's hooves. (PFFT like Celestia didn't do that already) The seven deadly sins are: Jealous, Vanity, Laziness, Lust
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Pandora Box Series – Susan Martin Maffei
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