Sekkiseki
From Bleach Wiki
The walls of Seireitei are made of stone called Sekkiseki (殺気石, spirit reducing stone), a material known to negate all Reiryoku, similar to magnetic lodestones. The stone also forms a spherical barrier around the city, stopping anything spiritual from breaching it. It is also used in the walls of the cell Rukia Kuchiki was detained in as she awaited execution. [1]
References
- ↑ Bleach manga; Chapter 104, page 12
