Get to the Keep Of Pale Night and find the dungeons (or enable the "Cheat mode" code, use the "Warp" cheat, and find "KPND"). In the dungeon, there are five levers scattered about. Once you have found all five of them, a message will appear stating that you have unlocked the cell room. Once in the cell room, you will see that the prisoners are the three main characters from Baldur's Gate: Dark Alliance. When you unlock a cell, the person will tell you that their weapon has been taken and is hidden in a sarcophagus that you must find. You will only get the weapon of the person that you unlock first. The dwarf will give you his Flawless +5 Axe, the wizard will give you her Flawless +5 Staff, and the archer will give you his Flawless +5 Bow. All weapons can be upgraded.