Kongoukai (ダイヤモンドレルム; lit. Diamond Realm), often referred to as the realms, is a nexus of pocket dimensions in Soul Society. They can only be entered into via artificial means, which are known only by the cult organization, the Inboyuigon. During a shadow war, the Sixth Division and the Tenth Division of the Gotei 13 broke into Kongoukai to combat the Inboyuigon. The technique used to enter Kongoukai was believed to have been discovered by members of the Onmitsukidō's Patrol Corps, who excelled in accessing various lands and dimensions.