The health of bosses has a huge range: In Classic Mode it ranges from 1,000 to 145,000. Mini-bosses appear only during special events, expressing the same amount of difficulty as many normal bosses. Event bosses will only appear during their respective events and leave when the event ends. 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. Each has its own particular way of being summoned. Defeating a boss is usually instrumental in advancing the game in some way or another, such as granting the player a new material for a pickaxe of a higher tier.
Bosses are aggressive, resilient enemies intended to offer a substantial challenge to players.
