Nirvana is what I call the core of the nexus, Nirvana is made from red, pulsating flesh with innards scattered on its walls and floors, with eyes and teeth visible in several spots. Some green tentacles will also attack people if they are not careful where they are heading and what they are stepping on.
When Sachiko Shinozaki became its master, it assumed the form of Heavenly Host Elementary School. It consists of a nexus of multiple dimensions inhabited by vengeful spirits. However, after Sachiko was appeased and left the Nirvana, it slowly returned to its original form and went out of control.
Within Nirvana, there are six pillars called the Pillars of the Six Demons which serve as both part of the sealing and its control mechanism. Each one is held by a guardian of some sort, and can apparently only be removed from them safely by a descendant of Shinozaki family.
At the core of the Nirvana is Queen, who was the leader of the European witches who were killed during the witch hunts in the middle ages, and also the will of the Nirvana itself.
Anyone who dies within the walls of Nirvana will have their existence erased from the real world and their souls will be trapped inside, forced to relieve the pain and suffering of the moment of their deaths over and over for eternity.
There are three known methods to enter the Nirvana:
Performing Sachiko in the Everafter charm incorrectly
Performing Holy Shroud's Promise charm incorrectly
Joining the two halves of the Everafter Stones along with the correct incantation
That is all I can remeber
