Location Of The Stone Of Thrist:

You can find the Stone of Thirst inside Disciples' Tower, but you'll also have to get the Incantation for the Stone of Thirst to use it. In the Cathedral Courtyard, remove the boards that block a pathway, then continue to a grave =. Use a Dragon Tears on the grave an dequip the Ring of the Dead to raise him from his final resting place. (A ghost there will reward you with the Incantation for your trouble.) Head back to Disciples' Tower, then follow the red carpet inside to a door with an arrow on it. Go through the door then down the stairs. One of the doors in the hallway opens to a room with a bed, where you will be able to put your incantation to good use. Talk to Dorn, who has a valuable item. The Stone and Incantaion. It will allow you to drain the water form the reservior, so you can access the Control Room.