Zhenyü's suggestion sounded highly feasible and was well worth a try.
"Yanshuo, do you know anything about the Tiangang Great Array?"
"The Tiangang Array is not difficult; many books record it. But there is a crucial problem: where to place these eight pillars representing the Tiangang. They certainly cannot overlap with the twenty-eight pillars on the ground. Doing so would form the Tiangang Array, but it would be restricted by the forty-four stone pillars underground, causing the formation to fail or even trigger a backlash. The best approach is to find a way to erect eight stone pillars directly above these twenty-eight pillars to serve as the Tiangang array pivots."
Chapter 690