After Hades steals Persephone, she eats a pomegranite and thus cant return to Olympus or the mortal world. Hades and Demeter (Persephone's mom) compromise and she only has to stay in the underworld for 1/3 of the year.
Answer:
lol I don't know. It's probably mostly for decoration. That's a cool thing.
Explanation:
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