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These are the characteristics of an epic poem.
What is
1) Begins in media res (in the middle of)
2) Begins with an invocation to the muse.
3) The hero is important and well-respected.
4) He goes on a journey to find something that is important to him or his people.
5) There is divine intervention by the gods.
6) The hero journeys to the underworld or experiences a symbolic death.