Reverse Four Symbols Sealing

The Reverse Four Symbols Sealing is a powerful fūinjutsu activated upon the user's death. The user must, beforehand, place the seal across their chest. Upon activation, it releases four symbols from the user's own blood 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.

Trivia

 * This technique has the opposite effect of the Double Tetragram Seal, a technique which allows Naruto to draw out the Nine-Tailed Demon Fox's chakra from within himself.
 * 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".
 * In Naruto Shippūden: Ultimate Ninja Storm Revolution and 4, this is a one-hit KO technique in Danzō's awakened state if the opponent has no substitutions remaining.