Black Iron Door Sealing Technique

This technique is multipurpose that can be utilized to suppress a significant amount of chakra within a location or individual. Additionally, as shown by Soyoka Teiketsu, this technique can be used to bar an individual's access to their own chakra supply. Unlike seals this technique isn't designed to allow the sealed chakra to merge with the target's own energy, reminiscent of an impenetrable iron gate. Because of this strict prevention the use of this technique can result in a variety of adverse effects if it isn't performed carefully on a living target, such as variable amnesia as seen when the technique was performed on Nōsei. These effects can be rendered null, if and when the seal is removed.

In order to perform this technique the target must be stationary, and in the case of living targets potentially immobilized. Additionally, an array of paper talismans need be placed in certain intervals around a target upon a spiral design transcribed onto ground with charcoal. Upon activating the technique the talismans will ignite, starting the outermost tags. Next, the charcoal design will retract in on the target eventually branding them with the seal. Individuals who have had this technique placed upon them appear to be put under a significant amount of discomfort during the sealing process.