Mad God's Temple & Unter Brae

If you have created your Party go to the old Man (Review Board) in Skara Brae. He will told you to kill Brilhasti. Now go to the Mad God's Temple. The answer to the priest is CHAOS. Now you are in the Unter Brae Dungeon. There is a small room at 10N of the entry stairs. Do not enter it! Go to 14N and 1W, turn west and cast the Phase Door Spell. You will find the Exit to the next level on 14N and 2W of the entry stairs.

The second level confused me a little bit. Sometimes you will see no wall, but there is a wall. Go to 6N 14W and cast the Phase Door Spell again. The Exit to the third level is at 5N 14W. Don't worry about the answer at 3N 13W. I don't know the answer and it's not important to enter the next level.

The third level is very easy. Go to 2N 14W, turn south an cast the Apport Arcane Spell (APAR). Teleport your Party one south. On 14W you will find a Portal to the next level.

Now you are at the last level. Go to the door at 19N. Enter the small room. In the right corner you will find Brilhasti. After you have killed Brilhasti your Party will be teleported back to the Review Board.

These tips submitted by SchwarzeneggerC:

In level 1 the word to walk through is simply blue (the shade of the wind's home ya remember).

Level 2 asks for the thing that doesn't and isn't anything, meaning a shadow.

Level 3 asks for the adventurers best friend namely a sword.