Hammond is a slaver and former member of Jad Karadin's gang. Other members of the gang are Selyse, Lund and Vienne. He is one of the persons responsible for the death of the witcher Aiden of the Cat School.
He can be encountered in Trottheim, where he is shown meditating before an altar with the intent on taking part in a pillaging. Geralt of Rivia can fight him on this occasion. Close to the altar, a letter from Karadin can be found that provides useful information to the quest Following the Thread.