Way to unlock: After you complete A Fallen Sister quest
Quest giver: Gertrude (M17,8)
After you kill the Fallen Sister, in the same cave, you notice imprisoned people behind bars (M17,8). Talk to one of them - Gertrude. You can free them with the key that you find in the Southern part of that cave (M17,8a). The woman behind the bars hints you about the right way, by saying "warmer", "colder".
After you collect the key, return to the woman and free the imprisoned. The woman - Gertrude - returns to Watcher's Reach and the becomes a trader there.
Rewards for completing the quest:
- Experience (little)
- 160 Influence points