Ovid also briefly mentions the "katabasis" of Hercules in book 7. A "nekyia" is not necessarily the same thing as a "katabasis". The "katabasis" of Virgil's "Aeneid" occurs in book 6 of the epic. In Ovid's poetic collection of mythological stories, he includes accounts of "katabasis" as well. "Katabasis" is the epic convention of the hero's trip into the underworld.