In The Ruins of Welryn, there was a human dressed the same as the cultists that fill the streets of the city. Yet, unlike the others, she appeared to be clear of mind. The woman informed you that there are others like her hiding below the city and asked you to aid in their escape.
The woman turned out to be a liar and attempted to lure you into a trap. You fought off the ambush and returned to confront her, only for her to transform into a Void monstrosity. These ruins seem to hold only madness.