Defeat it and the key.
Skyrim mzulft aedrome locked door.
Mzulft is an extensive dwarven ruin south southeast of windhelm along the main road between windhelm and riften.
Go all the way to the end of that path and there will be a boss that depends on your level.
This can be fixed by shouting at him and if that does not work try reloading and making sure he opens the door.
It is quite a distance southeast of windhelm and a short distance directly north of cragslane cavern.
It is the location of one of two oculories in skyrim the other is deep underground in blackreach and this feature in particular made it a target of a secret project conducted by the synod.
Having trouble finding the key.
Access to virtually all of the three zoned main ruin is blocked by a locked door which cannot be picked until you begin the college of winterhold quest revealing the unseen.
It is found along the western side of the mountains of eastmarch.
The first locked door s key is through the door on the opposite side of the room.
Opens a door leading toward the mzulft oculory from the main section of mzulft aedrome.
Or you could hit the tilde key in front of the locked door click on the door and type unlock if the door was targeted in the console it will say unlocked door of course thats just for the pc.
Below tags are for google search to combine if someones using a lot of words skyrim locked door skyrim t.
In the mzulft aedrome after paratus decimius opens the door to the oculory he may stand there even after telling him about the focusing crystal and he expects to be followed.