A remote valley in the Byeshk Mountains, between the Eldeen Reaches and Droaam, is the site of a dangerous manifest zone. Whirling blades like the ones that roam Shavarath sweep through the valley periodically, shredding anything in their path. As a result, nothing grows in the Valley of Blades, and even the animals of the Reaches avoid it.
For every hour characters spend in the valley, there’s a 40% chance of encountering a cloud of blades that attacks for 2d4 rounds and then disperse. In each of those rounds, the blades attack every character, using an attack bonus of +10 and dealing 2d6 points of damage on each successful hit. The blades are treated as magic and evil-aligned weapons for the purpose of overcoming damage reduction.
Legends tell of an ancient stronghold of the Dhakaan Empire situated in a valley within the Byeshk Mountains. Numerous expeditions have failed to uncover this stronghold, and many scholars now believe its ruins lie beneath the Valley of Blades.