Soul Society

Soul Society is the main setting of Kingdom Hearts: Arcana, and is Nathaniel DreadBane's homeworld. It is parallel to the World of the Living, and is the place where most departed souls and the Soul Reapers dwell.

Setting
Soul Society is the place where souls go after they die. This world consists of the Rukongai, where souls first live when they arrive in the Soul Society, and the Seireitei, which is at the center of the Soul Society. The mode of life here closely resembles that of feudal Japan.

Because Soul Society is on the same dimensional plane as the Outer Worlds, Soul Reapers (namely DreadBane) who leave Soul Society do not need a Gigai to be seen by the inhabitants of other worlds.

Rukongai
Rukongai (流魂街, wandering soul city), also known as the Rukon District, is the largest portion of Soul Society and the most populated. It is divided into 320 districts (80 in North Rukongai, 80 in West Rukongai, etc.), each numbered in descending order on how far they are from the center; this results in the higher-numerated (and farther) districts decaying into slums.

101 years ago, many souls in Rukongai mysteriously vanished due to the experiments of Sōsuke Aizen. These occurrences continued for about a month before the Shinigami sent Kensei Muguruma and a team from the 9th Division to investigate. The Vizard were Hollowified in a forest in the west of the 6th ward of the Fugai District on the same that the 9th Division team arrived to begin their investigation. Tessai Tsukabishi used forbidden Kidō to teleport the Vizard back to the lab of Kisuke Urahara in Seireitei in a bid to save them.

Seireitei
Seireitei (瀞霊廷, court of pure souls) is in the center of Soul Society. It is a circular shiro with four main entrances, ten days walk apart, each guarded by a Gate Guardian. The walls of Seireitei are made of Sekkiseki (殺気石, spirit reducing stone), a rare type of stone known to negate all Reiryoku, similar to magnetic lodestones, which prevents the ability to gather Reishi underneath your feet to walk in the air whist within Seireitei. The stone also forms a spherical barrier around the city, extending above and below, stopping anything spiritual from breaching it from ground level, from the sky or from underground. Within its walls live the 13 Court Guard Squads, as well as the Kidō Corps and the Onmitsukidō.