Not only did the Crystal Ore within the Chimera Valley in the Underground City have a massive yield, but it also had several pieces of premium quality. Amongst them were the Illusory Crystals that could be used to record the situation happening within a scene.
To strengthen the defenses of the territory and prevent another surprise attack from the pirates, Goode had instructed the soldiers to build obscure, small-scale Magical Spell Formations at important areas within the region. These collected the images and sounds captured by the Illusory Formation and were sent to the intelligence department for timely analysis, as well as filtering out the valuable pieces of information.