The Aeneid, by Virgil, is one of the great world epics. Inspired by, and modeled after, the Odyssey, it's the story of Aeneas's journey from burning Troy to found the Roman empire, and all bleeding ground, sad Cyclopes, and bellybutton-wolves he encounters along the way.
The creature is the Camazotz, from Mayan mythology, and it's like Batman, only if a Batman was an actual bat and not only didn't have an aversion to killing, but was like super into decapitation all day every day.
The store: https://myths.link/store
The membership: https://www.mythpodcast.com/membership
The unicorn head feeder: https://myths.link/unicornhead