In the Reliquaries
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The "black boxes" found on Mt. Hikami were filled with life, with death, and with fear. In short, they were filled with human sacrifices.
Shrine maidens were put in these reliquaries to protect the locals by appeasing the "Shadowspring".
This "Shadowspring" served as a bridge to the Netherworld.
In other words, beneath the water, the source of all life, exists the underworld.
The "Black Water" came from the underworld itself and with it came disaster and ruin.
The border between life and death was faint in that place.
The shrine maidens were said to take on the memories of people who came to die.
This seems to be similar to the spirit channeling seen in other parts of the country.
To take on the memories of the dying is to share in death.
The maidens glanced people's souls as they died, taking their secrets as they were sealed in the reliquaries. The shrine maidens became one with the water to connect with the people they glanced.
The shrine maidens ferried people to their death, via the water.
The maidens of Mt. Hikami presided over death, but this may have been in effort to protect those still living.