Reihigi

The Reihigi (霊 秘儀, Departed Soul's Sanctum) is a newer area of the Soul Society which only allows those of a Captain level to enter. It is locked with powerful seals that require 2-3 Captains to lift. It is made to mimic Dangai Precipice World, being made of several "dimensions" of Reiatsu to stack on top of each other. This allows one to train for 2,000 Days while only 1 Day actually passes.

Creation
After the Aizen incident, the Soul Society implemented this "space" for the training of Captains and future generation Shinigami. It's final and outer wall is said to be lined with Reiatsu of all the Captains that protected and served during the Attack on the Soul Society by Aizen, Gin, Tosen and the 3 Top Espada. It is a large empty space, accessible only by using the power of 2-3 Captains to remove the seal. Unlike the Dangai World, it does not require the use of a Kaikyō Kotei to help with training.

Use
Admittance only allowed for those of a Captain level, Captains are allowed to have people accompany for training and such. The use of 2-3 Captains is needed to lift the seal on the door, and when opened releases tons of spiritual pressure. The use of this allows one to train for hours upon days upon months and even years while only one day actually passes. The area is quite dense, being able to withstand pressure of multiple Bankai at once in an enclosed area. Within the middle of it is a large building which has a holder for the Ōin, although not occupied at the moment. When placed within the Reihigi, the inner seal is opened creating a link to the Dangai World.