Four natural hills stood precisely on the east, south, west, and north sides of the location, subtly embodying the concept of the Four Symbols. Lin Tianchen decided to use these four hills as the foundation to set up the Four Symbols Concealment Array.
The primary function of this array was to seal off spiritual energy fluctuations. Later on, when developing weapons combining immortal Dao and technology here, spiritual energy fluctuations would inevitably occur. Such intense fluctuations would undoubtedly be detected by interested parties outside.
Therefore, the Four Symbols Concealment Array was indispensable. Here, it had to be said that the military's operational efficiency was truly remarkable. In just a single day, the Southern Theater Command had delivered all the materials and resources Lin Tianchen requested. Right after dropping off Kee'er, he was intercepted by several military trucks loaded with ten full carriage loads. Lin Tianchen and the others simply drove the trucks to an uninhabited area and left them there.
Chapter 119