A mighty fortress like Celestial Radiance Pass, if left an isolated city, would eventually be breached, no matter how powerful its Grand Array. Once it lost the initiative, it could only passively endure the enemy's various tactics of attrition, and its fall would be just a matter of time.
Given the Demon Court's capabilities, if they were pushed into a corner, they could expend vast resources to alter the course of the Spirit Veins, cutting off the fortress's supply of Spiritual Qi.
In that case, even the several Spiritual Eye Objects within Celestial Radiance Pass and Pingyang Pass would be insufficient to support the Grand Array's full operation.
Yang Jing considered surveying the course of the local Spirit Veins a top priority. Only by linking a series of Arrays to lock the Spirit Veins into the ley lines could Celestial Radiance Pass and Pingyang Pass accomplish their mission of blocking the Demon Court army's path of retreat to the west.
