Tale of heroism. This is a more descriptive way of referring to a long heroic story. It simply emphasizes that the story is about heroism. It can cover a wide range of stories, from ancient myths to modern - day fictional accounts of heroic individuals or groups.
Well, 'legend' can be used. Legends are stories that are often based on real or partly real events or people but have been embellished over time with heroic and extraordinary elements. They can be passed down orally or in written form and usually involve a hero or group of heroes who do something remarkable. Take King Arthur and his Knights of the Round Table as an example, it's a well - known legend.