Wandenreich Medallion

The Bankai Ensnaring Device (卍解籠絡設備, Bankai Rōraku Setsubi) is an object used to steal a Shinigami's Bankai. Muramasa Neikan modified the device to steal Resurrección as well.

Overview
It is a convenient seal, taking the form of a badge, which can be used to steal the Bankai of a Shinigami. It seems to be only able to steal one Bankai at a time. It also seems that other users of the device can detect when another user has used the badge on a Bankai user.

Modifications
After being brought to the Impero Nascosto by former members of the, Muramasa then mass-produced the badge, allowing it to be used by many of the members of the Impero Nascosto against their foes. He also modified it to allow the badge to have a similar effect on the Resurrección of an Arrancar. It still has the "one use" rule applied to it.

Use
When the badge is used, a circle of energy with the insignia of a Quincy cross on it manifests. It quickly changes into a giant cross with several white holes on it. Beams of light then rain down from the seal, ensnaring the Bankai/Resurrección user, causing their release to deteriorate and fade away. It seems like the seal has some sort of indicator that it has been filled, as noted by a member of the Vandenreich. Though it is rare, in the case of, the seal failed and was shattered. The exact cause of this is unknown.

There is an incantation required for activating this effect. It is "Melt! Sea become clouds. Clouds become rain. Rain become mist. All things that have shape, vanish! At the end of our joy we throw the cup to the ground!"

Trivia

 * It has never been named in the manga, therefore the article is subject to change.