How is the mythical world presented in epic legends?

One of the famous heroes of legends is Sadko. Poor guslar, who met the king of the sea and ended up in his kingdom. Orpheus, out of boundless love, decided to communicate with Hades himself. Hercules accomplished his feats. But Ilya Muromets, Alyosha Popovich and Dobrynya Nikitich are real people, but this did not prevent people from assigning them various qualities that are characteristic of mythical heroes.
The people embodied their dreams and hopes in myths and legends, looked for those features in the invented heroes that they lacked so much.
The epic world is presented in completely different ways. In some legends he was beautiful, in others he was terrible.