The final stretch!

Terraria's endgame begins after defeating the Golem boss. Prepare for the final boss and a four-stage gauntlet.

After defeating the Golem boss, you gain access to the entire world in Terraria. With your Picksaw, strong tools, and great equipment, you are ready for the final stretch of the game. This involves a boss, a four-stage gauntlet, and culminates in the most difficult boss of the game, offering a fantastic conclusion.

You can continue playing Terraria in its sandbox (a game world that allows for open-ended play) environment after beating the final boss. However, this marks the end of progression, as there are no more bosses to defeat after this stretch.