The Reverse Four Symbols Sealing Technique is a fūinjutsu and a stronger version of the Four Symbols Seal. The user places the seal across their chest, and sets it to activate upon their death. It releases four symbols from the user's body that then forms a large, black sphere around them. Anything caught inside the sphere's area is then drawn in and sealed within the user's corpse.
The name and appearance of this technique are a reference to the Chinese "Four Symbols", known as "Si Xiang", which are produced from yin and yang, and act on the ba gua. These symbols are named: "lesser yin", "great yin", "lesser yang" and "great yang".