Dungeon

Dungeons are the instanced areas where dungeon runs happen: a group of players fights through a procedurally generated set of rooms and ends with a boss fight.¹ Runs give Dungeoneering XP and loot from reward chests, and harder runs pay better.¹ So far The Catacombs and its Master Mode are the only dungeon.¹

Getting in. You start a run by talking to Mort at the Catacombs Entrance or in the Dungeon Hub. By default you need a party of 2 to 5; Saul's Recommendation lets you go alone.² The Catacombs have an Entrance and seven floors, each unlocked by clearing the one before; beating Necron on Floor VII opens Master Mode.²

How a run works

Clearing a room's starred mobs drops keys that open the next part of the floor; the Blood Key leads to The Watcher, whose undead must be killed before the boss room.²
Each player picks one of five classes: Healer, Berserk, Mage, Archer or Tank.¹
Dying turns you into a ghost who can be revived; you don't lose coins.²

Rules inside. Potion effects from outside are paused, the Auction House and Bazaar can't be opened, speed above 100 counts for a third less, and anything you buy is paid from your Bank.²