Sekisenmon

The Sekisenmon (関 泉門, gated entrance to the underworld) is a blend of Kidō and Science. Taking the form of a small mirror; it has a golden eccentric pattern around it with a circular glass mirror dead center. He has shown to seek to use this to drain the reiatsu of every soul in the Soul Society and use it to devastate the balance of the world; living and dead alike. It is believed that Hankō cannot yet use its abilities and the Soul Society are making an effort to find and stop him before he can eventually use it to wipe out existence as the worlds know it.

Creation
Originally created through years of Kidō research, Hankō eventually was able to create it with the concentrated Souls of the Kidō Corps. Not enough to actually bring it to its full potential; Hankō originally wanted to use it to create an artificial balance that would stabilize in the Dangai World. Only after seeing what it could do, it plagued Hankō with thoughts of ultimate power and destruction. Sadly, the original Sekisenmon was not stable and was destroyed into pieces. He now seeks to rebuild a stronger and newer Sekisenmon to fulfill his goals.