Seireitei

Seireitei (court of pure souls) is in the center of Soul Society. A circular shiro with four main entrances, each guarded by a Gate Guardian, surrounds the Seireitei, keeping unwanted visitors out. The walls of Seireitei are made of stone called Sekkiseki (spirit reducing stone), a material known to negate all Reiryoku.The Sekkiseki prevents commonly used abilities, like using Reshi to walk on air and limiting powers. Surrounding the Seireitei is also a spherical barrier that prevents anything spiritual from breaching it.