Karthis al-Hezzar is a Tethyrian merchant who lived near the city of Saradush. In Throne of Bhaal, if you save him from Yaga-Shura's, soldiers, he will talk to you and thank you for his life. For not demanding a reward, the party receives 1,000 gp and +1 to your Reputation. You will also be able to buy his wares. He sells many magical items that are not available from most other merchants.