Watchguard of the Reaching

Walkthrough
Begin the quest by going to the mages tower third floor. Click on the statues in the following order - Bowl Statue (left) - Sword Raised Statue (right) - Sword Lowered Statue (middle)

Then go to the central room and click on the statue with the shield. Rembember you get no reaction. If you get shocked, you need to start over because you clicked too many times. After you do this, the basement opens.