Dungeon

A dungeon is a set of maps where defeating a mob on one map takes you to the next map of the dungeon. Entering the dungeon requires a key of some sort, and there is often a special prize for completing all levels. In many dungeons you can also fight unique monsters that may drop special set items.

Dungeon mobs respawn when attacked instead of after being killed. This is to prevent waiting when two or more parties go through the same dungeon at the same time. All dungeon mobs are passive unless noted otherwise.

Since the 1.20 update is it NO longer possible to join and defend a perceptor whilst in a Dungeon.