Yin and Yang Interlocking Formation

A powerful barrier formation noted to only be usable by the four Yonkō, whom had created the technique, and ideally can only be used by the four of them when they work together; Seireitou Hyūga, Ryun Uchiha, Echo Uchiha, and Hikaru Kurosaki. When the four of them are together, standing in a square formation, they can erect a large barrier that is black in color with an ominous purple hue. It was stated to be several times stronger than the Four Red Yang Formation, and is highly malleable, capable of altering itself to deal with whatever threats are hidden within its confines. The black color comes from the imbued will that the four of them had infused into the structure. It was designed to hold Myoken while Seireitou and Ryun fought him; having left behind clones of themselves to erect the barrier while the real ones fought on the inside.