A note found in Shadowfell Keep reads:
Greetings Kalarel. I have recently learned of your activity in the area and have an offer for you. During your time in this region, if you capture any humanoids, we are eager to buy them. We have duerger allies in Thunderspire in need of slave stock. If you are interested, send an envoy back to me. My messengers will show you the way. Chief Krand of the Bloodreavers.
Lord Padrig of Winterhaven should be made aware of this.