Defias activity? Well, there's always some activity; even if they keep to themselves we consider them a threat.
But now that I think about it, there was a recent sighting that seemed odd. It must have been a couple weeks ago, but some of their agents had gathered around Addle's Stead. From the report, I'd guessed something big went down.
Why don't you check there first and bring me back anything you find?
The farmstead is south of the road from Westfall just as you enter Duskwood.
Be careful out there, <name>. I know Trias was the one to send you here, but that doesn't mean there isn't anything lurking out in the woods that couldn't cause you some trouble... especially with you investigating the Defias.