Silver Horse Talisman, and which well?

I was charged by a stolen soul in a dream to drop said talisman down a certain well. I tried the one in the Forgotten Quarter, and the only option led me to start Seeking, which I stopped ASAP.

I know there is a similar well in the Tomb Colonies, but I do not want to go back there yet. Can anyone confirm if I am barking up the wrong tree? For all I know, the well I want might be in the Khaganate.

From the wiki:

So it seems like unfinished content.
edited by Kaijyuu on 3/2/2018