From the introduction:
The Tower of Ashaf is one of the many towers in Herath that was destroyed or abandoned when magic stopped working and the goblins swept down from the steppes.
The Tower of Ashaf lies in the Highlands of Nazbuth about 112 miles southwest of the ruins of Nazbuth and about 32 miles northeast of the Tower of Yechir. As this is a pretty remote area, the PC's will probably only pass through here on their way to somewhere else (like Asgamoth, Herath's capital, if heading east, or Nimmur, if heading west).
A relatively free-form/sandbox "side" adventure for characters of 1st - 10th level.