Mysterious key

[Shep]

After receiving the key where do you go next in the quest?

Also where do I find the 3rd loreseeker reilla?

Another is I have love letters from lady naramth where do I take those too?

 

[Eliadann]

Love letters: nobody knows yet

Third loreseeker: in the dungeon east of New Garand

Mysterious key: I can´t remember

- Elia

 

[new4or]

Another is I have love letters from lady naramth where do I take those too?

it is marked as incompletable in your quest log in the game) as well as couple other quests)

mysterious key - sounds like item from Key to the past quest
finish the lorekeepers and you'll see what to do next)

 

[Shep]

I figured it out, I went down there and went through the whole dungeon before I made it that far into the quest so I didn't think about going back down there