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Once inside the main room, shut off the steam valves to gain access to the forge itself, which will trigger a battle with many Dwarven automatons in quick succession, followed by the main boss, the Forgemaster. Once inside the ruins, follow the path to another tonal lock, which is much less complicated than the first one and simply requires the player to hit all of the spinners in any order. After reaching the ruins, place the shards on the pedestal in order to gain access to the elevator into the main dungeon and the final part of the Lost to the Ages quest. The Aetherium Forge can be accessed through the Ruins of Bthalft, found south of Ivarstead. This side room also has a large number of Dwarven scraps that are useful for leveling up the Smithing skill or making Dwarven Bolts for the Crossbow. After taking the final Aetherium Shard, Katria will congratulate the player and tell them to meet her at the Aetherium Forge. After entering this building, players will either need to unlock an Expert level door in order to reach the Aetherium Shard or go around through a connecting room that has a far less difficult lock to lockpick.
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However, the Aetherium Shard isn't found inside the main dungeon and is instead located in a separate building, found just outside of the main entrance to Mzulft. Related: Ranking Skyrim’s Jarls From Worst To Best
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This major city isn't one currently inhabited and refers to Mzulft, the Dwemer ruin that players are sent to for the College of Winterhold quest Revealing the Unseen, where players are tasked with finding a map to locate the Staff of Magnus. The location of this Aetherium Shard is said to be a storage site for raw Aetherium, near a major city. The final shard, much like the second shard, isn't found inside a large dungeon, though it is located behind several locked doors instead. Once the Centurion has been defeated and the Aetherium Shard has been taken, players can move on to the next ruin and the next shard. While most of these gears are relatively easy to spot, there is one elusive gear underwater, just above where the bridge falls. In order to open this door, the player needs to unblock all of the gears in this room to make the bridge fall and allow the player to move forward. In the final room, however, there are not only many Falmer and Chaurus to contend with, but also another Dwarven Centurion that attacks the player once the door to the Aetherium Shard has been opened. There aren't many tough enemies that make life difficult inside Raldbthar, though there are some Falmer and Dwarven automatons that are common to all Dwemer ruins. Once the bandits have been cleared from the main area, head into the far room at the back of the dungeon to enter Raldbthar Deep Market and head deeper into the ruin. If players haven't already done the Dark Brotherhood questline, Radbathar is found west of Windhelm, just south of the main river, and is usually inhabited by bandits. The third entry in Katria's journal describes the primary source of Aetherium, which is located inside Raldbathar, a Dwemer ruin that players must enter for one of the assassinations in the Dark Brotherhood quest Mourning Never Comes.