As soon as Rean finished saying that, he fuelled the formation core with some of his Rank Three Spirit Stones and activated it. In less than an instant, some kind of dome spread around the area, connecting to seven different spots on the valley's borders. Those were the Concealing Formation's supporting structures.
Soon after, that dome seemed to turn hazy until it finally disappeared. If one looked from the inside, one would be able to see the sky without any issues. However, those who looked from the outside would only see a valley covered in mist that prevented Spiritual Senses from entering.
