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Volume 30

Chapter 286: From Sen: Karasumori is a spirit reservoir. The power of the land does not come from the site itself, but the person. They are considered immortal. According to one theory, the reservoir is born around a mystical site, just as the deity is about to be replace (Karasumori doesn't fit that haha. Bad Tokimori.)

The Kekkai is created by the founder, which is maintained and fastened underground by 4 powerful artifacts located at the Kekkai's four bottom corners. Sumiko calls the place "The Underworld". Kekkaishi need to create a Kekkai to protect themselves fromt the Underworld.

290: The Castle is the Underworld and one it's master leaves, it is no more. Time stops in Karasumori's Castle.