The Underdark | Adalon's Lair | Ust Natha | The Beholder Dungeon | The Mind Flayer Dungeon | The Kuo-Toa Dungeon | The Exit Area
In the Underdark, speak to Uder Mordin at 3. With a little prodding he will tell you of a Mage who got himself imprisoned in the area.
Buy a Scroll of Freedom from Carlig and have one of your mages use it from a quick item slot anywhere in the Underdark. The imprisoned Mage, Vithal, will be freed and appear at 7. When you go near the place, he asks for your help in acquiring the treasure he was looking for. Vithal needs you to find his Book of Rituals and then to help him fight whatever monsters come out of the three portals when he enters the elemental planes of Earth, Fire, and Air.