The key is used to open the gate to fight Fareed in the Desert Treasure quest. The key is unobtainable after opening the gate. Attempts to re-obtain the key will result in the player receiving the message "There is nothing inside the chest." and all of the lamps used to open the chest cannot be relit. The key CAN be kept if you leave the dungeon, so low levels could do two trips, to restock before the fight. Note that the key will not appear in the chest if you have one banked. After the quest, Fareed's room can be entered without the key.