I always hear about epic battles. Who will explain what an epic battle is?

Epic first appeared in World of Warcraft. Those who haven't played may not know. Generally speaking, it is something, events, weapons and equipment, people and so on that can go down in history as an epic. Later, the game was all the rage, and players used to call the more powerful things epic, which was widely used on the Internet. Therefore, some publicity companies also call it epic when doing some movie promotion or game promotion.