Bosses

Bosses are aggressive, resilient enemies that offer a substantial challenge to players. Defeating a boss is usually instrumental in advancing the game in some way. Each has its own particular way of being summoned. For example, most bosses have associated summoning items that can be used to spawn them manually under certain conditions, while there are others that will appear after the player interacts in a certain way with the environment. Event bosses will only appear during their respective events and leave when the event ends. Mini-bosses also exist and spawn naturally in various biomes under various conditions, which pose a lesser yet still difficult challenge for unsuspecting players.

Secrets of the Shadows expands on the number of bosses that can be challenged throughout the game, each featuring unique AI and drops. Most require the use of boss summoning items in order to spawn, but others have more unique prerequisites. The mod currently adds six new boss encounters.