In this content rich game. You fight enemies, bosses and megabosses. However. It's balanced. You start in Pre-hardmode. You need to defeat Atlas to go into Hardmode. Where more stronger bosses will spawn. You need to beat the Aurora Twins (Hyoga and Raito), The Hydra, Leviathan and Eye of the Storm. The bosses however, address you as the Fallen Hero, for example, The Paladin and Alrasid call you Fallen Hero, while the other bosses with no dialogue don't.