Bosses - Official Calamity Mod Wiki

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.

Bosses - Official Calamity Mod Wiki

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Bosses - Calamity Mod Wiki

Calamity Mod All Bosses and Minibosses in a Nutshell