The Elder Scrolls V: Skyrim Special Edition

For this achievement you will have to either travel to Arkngthamz or find a book in Fort Dawnguard called The Aetherium Wars read it and also take it.



When you enter inside Arkngthamz a ghost voice will keep telling you to turn back , you just keep going and soon you will meet Katria ,accept her offer to help and then the quest will begin Lost to the Ages.Not far from where you meet Katria you will find her body and you can search her to get Katria's Journal.

You will get to a point when Katria will say that this is where she had her fall and that her bow is at the big log there , when this happens do go and get the bow Zephyr as you will need it if you do not have a bow on you.

You will get to a place where the Tonal Lock will be,basically you will need to arrow hit the blue marks in a correct order ,aw and don't worry about arrows as there are plenty on the floor near the dead skeleton you can just pick some up or if your a mage you can just fireball them as that works also.

Now if you check the Katria's Journal you can find the number 1 is the bottom left , the 2 is bottom right and the rest are trial and error but here i will list them anyway.
1.Bottom left
2.Bottom right
3.Top left
4.Top right
5.Middle

Go inside and get your 1st piece of Aetherium Shard (1/4).

Now can exit this place and travel to Raldbthar.


Here are some bandits and after those will be falmers. You will get to a point where you will have to remove human parts from the mechanism , just have in mind that one is underwater.
Soon after you get the 2nd piece of Aetherium (2/4).

Next location is near Mzulft called Dwarven Storeroom North of Riften.


After you lockpick the Expert on the Door the Aetherium shard is behind it (3/4).

The last piece is at a small shrine after crossing the Deep Folk Crossing located north-east of Markarth(4/4).




Now we going to the Forge and that's in the Ruins of Bthalft.


Here when you do get inside you will need to either use a bow again on the 2 blue mechanism or just fireball them to open the door.

Defeat the guardians and then you can craft 1 item out of 3 :

Aetherial Crown : 2 Flawless Sapphire
2 Dwarven Metal Ingot
2 Gold Ingot
1 Aetherium Crest


Aetherial Shield : 4 Dwarven Metal Ingot
2 Regined Malachite
1 Aetherium Crest


Aetherial Staff : 2 Dwarven Metal Ingot
2 Ebony Ingot
1 Gold Ingot
1 Aetherium Crest


Now while you are looking at the forge turn right and go to the table , there's a chest on the table and inside are all the materials you need.

Take them all and craft what you will like , after that you talk to the ghost and achievement pops.

Good luck and enjoy Skyrim on the One .

EDIT: Skuller 101 mentioned that ''if you enter Mzulft or Raldbthar before accepting this quest the quest will glitch and not start''

EDIT: Not sure why the negative so please do leave a comment if something is missing and ill adjust the guide thanks!.

*Update 2022*
"I was able to unlock this by using "setstage DLC1LD 100" to start the quest and "setstage DLC1LD 255" to complete it" - Thanks to TBonePhone

Original Solution:
You will need to explore an ancient Dwarven tomb and uncover four pieces of a lost key, then use this key to unlock an ancient Dwarven forge and craft one of three unique items.

You can do this a lot quicker with CCs.
To use CCs (console commands) press ~ on your keyboard, type the command, then press enter.
Some good CCs:

This quest is a bit screwy with using CCs to advance the questline so you are going to have to do this "legit" and follow the actual questline making sure to fulfil each objective as it comes:

- teleport "coc DLC1ArkngthamzExterior02" then go inside the large door where you spawned to enter Arkngthamz.

- continue along the path and speak with Katria, you can skip dialogue with left click. This will activate the quest. Tell her to come with you.

- continue along the linear pathway for a little while until you reach an area with 5 tonal locks, Katria will talk to you about hitting them in the correct order.

- toggle no clip "tcl" fly and hit them in this order: bottom left, bottom right, top left, top right, middle.

- enter the gates and pick up the Aetherium Shard, then talk to Katria again.

- now you will need to locate and manually pick up the rest of the shards. Adding them to your inventory does not work.

- teleport "coc DeepFolkCrossingExterior02", the shard is behind the pedestal in front of you. Talk to Katria after.

- teleport "coc RaldbtharExterior04", toggle no clip "tcl" and fly into the roof you just spawned on, then hit the lever to travel down to Raldbthar Deep Market.

- if the door is locked here, just no clip through it. Then you need to kill all the enemies and you can pick up the next shard (unmissable). Talk to Katria after.

- teleport "coc Mzulft04z", the Dwarven Storeroom, and continue forward, again if any doors are locked just no clip through and pick up the shard (unmissable). Talk to Katria after if she approaches you. While you're here, grab 5 Dwarven metal too. Now you will need to locate the Forge.

- thankfully Dovahkin has google maps installed so teleport "coc BthalftExterior01" and kill all the bandits that may spawn here (do not use killall as it may kill Katria).

- follow the quest steps now as they are self explanatory, then go into the Forge.

- continue along the path, torches will light along your way. Once you get to the Forge there are two valves on either side you can use to turn off the steam. You will need to fight a bunch of enemies and a mini boss, just toggle god mode "tgm" if you haven't already and whittle them down.

- once you get to the objective to use the forge, there is a chest on the side of the room with a bunch of materials in case you missed them in the Dwarven Storeroom, then just craft one of the three items using the forge, and talk to Katria to complete the quest.

Pressing ~ will open the console command window. (top left under ESC)

You want to type into the console:

setstage DLC1LD 255

Your achievement will pop!