Dangai

The Dangai, or Dangai Precipice World to be specific , is the dimension between Soul Society and the Human World. Naturally, the Dangai has some defenses against Hollows and other spiritual beings attempting to pass through the realm. This is why Shinigami are the only ones who can truly use it efficiently for travel between both the world of the living and the Soul Society.

Kouryu is the current that is constantly flowing through the Dangai, in order to prevent enemies such as Hollows from using it. The current stops souls from moving, and even one foot caught by it makes escape almost impossible. It encompasses the walls, capturing anyone who makes contact with them.

A Janitor, is the Dangai's equivalent to a street sweeper. The Janitor appears once every seven days to cleanse the area, killing anyone, and everything that makes contact with it. It looks like the same material making up the Precipice World, only molded into the shape of a bullet train, and a golden eye at the upper-center of it's body.