Final Fantasy XIV is gearing up for the release of patch 3.35, which introduces the Deep Dungeon. The Palace of the Dead is a (to start) fifty floor, randomly generated dungeon that can be explored in groups of up to four players. Your progression in the dungeon is separated from that of your normal adventurer, starting everyone over at level one and granting experience and equipment as you fight.
Rewards from the dungeon include experience, cosmetics, tomestones, and gil. Rewards useful outside of the dungeon are based on what level your various jobs are going in.
Players who do not own the Heavensward expansion are limited to the first forty levels. Given the messaging behind the patch notes, it is safe to presume that more stages will be added to the initially fifty in the future.
(Source: Final Fantasy XIV)
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