Beorhisto's Tower

Beorhisto's Tower is a tower built by the explorer Beorhisto a few centuries ago. It is a large stone tower floating on a rocky island in the Astral Sea. It is heavily trapped and guarded by magic, but it has been deserted for a long time.

The tower and anything inside it is totally immune to divination magic of any kind.

The Dogs of War have been using the tower as a base of sorts, and it is part of their portal triangle.