There are 22 Group Dungeons, one in each faction zone, one in Coldharbour, two in the Imperial City, two added to Shadowfen with Shadows of the Hist, and two added to Craglorn with Horns of the Reach. These are designed to be explored with a group of four players maximum. The enemies inside will be of a much greater difficulty than those in Public Dungeons, and unless you are in a group, you'll be facing them by yourself, because these dungeons are instanced—meaning you won't see anyone not grouped with you when you enter.
All Group Dungeons have Veteran Dungeon variants. These become available once you hit Level 50 and unlock Veteran content. These use the same maps and boss enemies, but the enemies have more health, deal more damage, and require more coordination to complete. They are understandably much more difficult, but earn you higher-quality loot and Veteran Dungeon Achievements.
Eight of the dungeons have a "Version I" and "Version II" storyline, which can be selected upon entering the dungeon. These take place on similar maps to each other, but with different enemies and mechanics. The quests in "Version II" dungeons continue the storyline established previously in "Version I".
These dungeons can be added to your map by talking to members of the Undaunted in the taverns of the major cities of each zone, and can then be teleported to directly from the Wayshrine fast-travel system. All Group Dungeons can be discovered this way. If you have not previously discovered a particular dungeon, the wayshrine for that dungeon will be added to your map upon acceptance of the corresponding pledge.
- Prior to the One Tamriel update, Veteran versions of the non-DLC dungeons continued the storyline established previously in the Normal level Group Dungeons. With One Tamriel, these former Veteran storylines became the "Version II" of a dungeon, and had a Normal difficulty added. Concurrently, the former Normal storylines became the "Version I" of a dungeon, and had a Veteran difficulty added.
- Prior to One Tamriel, dungeons had a minimum level of enemies within the dungeon and therefore the recommended minimum level of entry. Note however that it was still possible to enter before this level. When entering a dungeon, all enemies, minibosses and bosses were scaled to match the level of the group leader, or if the leader was below the minimum level of that dungeon, all enemies were set at the minimum level for that particular dungeon. With One Tamriel, all enemies and players in dungeons are scaled up by Battle Leveling.