Aetherium Forge

It is beneath the Ruins of Bthalft and can only be accessed after combining all four Aetherium Shards into the Aetherium Crest.

History
The Aetherium Forge was created by the Dwemer, and can use the crystal material Aetherium to create items. According to Katria, the Forge and its surroundings are at least 4,000 years old - ancient even by Dwemer standards.

Interactions
During the quest Lost to the Ages, the Dragonborn arrives here and can make an Aetherial Shield, Aetherial Crown or an Aetherial Staff.

There are several hidden chests within the Forge containing leveled loot. These chests are located on the balconies on either side above the Forge itself and can only be accessed by swimming through the lava behind the forge: there are gates to the left- and right-hand sides of the room.

In the first chamber, there is a waterfall. Behind the waterfall is a small chamber, and in that chamber is a hidden chest.

Another chest can be found at the base of the natural stone column to the left and behind the Forge; you can access it by swimming through the lava. Swimming through the lava can be accomplished by using the Become Ethereal Shout, but be aware that like Invisibility spells, interaction with objects (such as the gates) deactivates the Shout midway through its duration, if you're a vampire lord, you may also use mist to get across the lava - stocking up on Resist Fire potions and garments enchanted with Resist Fire is highly recommended.

The lava deals two types of Lava Damage:


 * +150 Massive Fire Damage for 1 sec.


 * +15 Lingering Fire Damage for 4 secs.

Appearances

 * The Elder Scrolls V: Dawnguard