Senkaimon

From Bleach Wiki

The Senkaimon (穿界門; world penetration gate) is the dimensional gateway which Shinigami use to come and leave Soul Society by unlocking it. When guided by a Hell Butterfly, the Senkaimon takes the form of a waiting room entered through a sliding door. Humans can also use such a gate through the use of Reishihenkanki (霊子変換機; spirit exchangers), which convert solid matter into spirit particles. A variant on this gate using four marked points can allow entire towns to be moved into Soul Society, as is done to Karakura Town to prevent Sōsuke Aizen from destroying it.

Intruders can pass through the Senkaimon in the same manner. While this method uses the same gate, the lack of a Hell Butterfly forces intruders to pass through the Dangai (断界; prohibiting world), a bordering dimension between the Human World and Soul Society (not to be confused with Hueco Mundo). This is much more dangerous to do, as souls that cannot pass through before the gate to Soul Society closes are trapped there forever. It is possible for Seireitei to deactivate these mechanisms, allowing Shinigami or Humans to traverse the Dangai safely. While the Senkaimon are run by the Kidō Corps, during the Shūsuke Amagai arc it is shown that there are private Senkaimon own by rich families.

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