A boss arena is a battlefield designed to give players an extra edge when fighting against bosses like the Eye of Cthulhu or the Eater of Worlds. While boss arenas do vary depending on the boss being fought and the player's tastes, they typically have the following features: It is a good idea to place a Campfires and a Heart Lanterns around the arena, and having a Honey Bucket to quickly empty onto the player to give even more regeneration. These regeneration boosters could be life-savers when battling strong bosses.