Hunters who track down escaped Wookiee slaves and report on their location. The Empire and Trandoshans pay a high price for that kind of information.
While at a Kashyyyk site: adds 1 to your Force drains there, is power +1 (or +2 if your Trandoshan is on Kashyyyk) and, once during each of your deploy phases, may deploy one site to Kashyyyk from Reserve Deck- reshuffle.