The Undaunted are a guild that are optional in the overall storyline and do not count toward the achievement of completing the overall story, but it will definitely add to learning how to play the game and make the experience of ESO a lot better!
In order to get started find the Undaunted guild in any of your city as soon as you turn Level 10.
For the 3 different alliances these places are:
- Aldmeri Dominion - Auridon - Vulkhel Guard
- Daggerfall Covenant - Glenumbra - Daggerfall
- Ebonheart Pact - Stonefalls - Davon's Watch
You can find them sitting in the bars of these towns.
They will be sitting or standing around, enjoying a meal or talking to each other.
Just go through their initiation rite, visit the dungeon they tell you to (you just need to enter it, not to play through it) After you have done so, you will also be able to get points for the skill line, which will become very important in later gameplay!
If you want to experience the dungeons in the order they were meant to be, then this would be the order.
Auridon-> The Banished Cells I -> Grahtwood-> Elden Hollow I -> Greenshade-> City of Ash I -> Malabal Tor -> Tempest Island -> Reaper's March ->Selene's Web -> Glenumbra-> Spindleclutch I -> Stormhaven-> Wayrest Sewers I -> Rivenspire-> Crypt of Hearts I -> Alik'r Desert -> Volenfell -> Bangkorai-> Blackheart Haven -> Stonefalls-> Fungal Grotto I -> Deshaan-> Darkshade Caverns I -> Shadowfen-> Arx Corinium -> Eastmarch-> Direfrost Keep -> The Rift -> Blessed Crucible
After the last zone and the last dungeon in that zone you will get to Coldharbour. For Coldharbour and afterwards it looks like this:
Coldharbour -> Vaults of Madness -> Elden Hollow II -> City of Ash II -> The Banished Cells II -> White Gold Tower -> Imperial City Prison
Coldharbour -> Vaults of Madness -> Wayrest Sewers II-> Spindleclutch II -> Crypt of Hearts II -> White Gold Tower -> Imperial City Prison
Coldharbour -> Vaults of Madness -> Fungal Grotto II -> Darkshade Caverns II -> White Gold Tower -> Imperial City Prison
After this the dungeons will no longer be split by alliance, but be linked to either DLCs or chapters. This is the following order in which the DLCs were released and which dungeons are thematically attached to them or were released at the same time:
DLC Dungeon List
Gold Coast - Ruins of Mazzatun & Cradle of Shadows - Vvardenfell-Bloodroot Forge & Falkreath Hold-Clockwork City - Fang Lair &Scalecaller Peak-Summerset-March of Sacrifices & Moon Hunter Keep-Murkmire - Depths of Malatar & Frostvault-Northern Elsweyr-Moongrave Fane & Lair of Maarselok-Southern Elsweyr - Icereach & Unhallowed Grave-Greymoor-Castle Thorn & Stone Garden-Markarth - The Cauldron & Black Drake Villa-Blackwood