In the northwest corner of Dazhou Mountain, there was a natural valley. The north-facing entrance was nearly a thousand zhang wide, but it grew narrower as it extended inward. The entire valley was funnel-shaped, piercing through the mountainside until its narrowest point, which was only about one zhang wide.
When great winds blew from the north of Dazhou Mountain, they were blocked by the mountain, creating immense wind pressure. The airflow would then pour into this funnel-shaped valley. The farther one went, the narrower the valley, the stronger the pressure, and the faster the wind!
When the Seven Profound Martial Mansion was first established, this valley was named the Great Wind Valley. Inside, even stones the size of buckets were blown about, and it was impossible for people or livestock to keep their footing.
