Hey everyone, I am in the Roldbthor Market and at the very end of the dungeon, there is something I need to unlock and it says that I don't have the correct Item to unlock it. Anyone know what I need? Also just for clarity, it is the place with all the mechanical enemies, in the same dungeon as the first main Dark Brotherhood Contract. Thanks ahead of time for any answers.

Ps: Maybe not even any spoilers exactly but I just want to be safe

Is this part of an assigned quest? I've noticed that, for some dungeons, you can't get past a certain point without being assigned a quest elsewhere. There is a Dwemer ruin I couldn't complete until I was assigned a particular quest by an npc in Riften. Hopefully, that's what you are encountering here and not a bug.