

Players can attempt the same Set Dungeon repeatedly, in the same game, until they triumph or give up.

The monsters are not very high level (corresponding to about Torment 4) and dying in a Set Dungeon (even in Hardcore mode) simply fails the challenge and resets the player to the dungeon entrance. These always relate to the Item Set that dungeon is themed around, and require things like: killing all enemies or all elites with the special skill of that set, not running out of resource, maintaining a buff for at least 90 seconds, etc. Players must complete the dungeons within a short period of time (4:30) while achieving several objectives. Set Dungeons are non-random in layout and difficulty, (the difficulty of the particular game does not affect Set Dungeon content), and each presents a specific challenge.

There are 24 set dungeons, one each for the 24 item sets, 4 per class. Credit might not apply to all who run, more tests are needed. Groups may attempt them, but if one person fails an objective, it invalidates the whole run. They are special, custom-designed dungeons that each correspond to a particular class Item Set by characters geared in the corresponding item set. Set Dungeons were added to the game in Patch 2.4 in January 2016.
