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This is one of the Quest items from the Horrible History of Household Hell mystery that the player will receive after completing the mystery's sidequest.
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An article covers a group of scientists from Tokyo. They were exploring and mapping weird cave formations, found in the cliffs.
(...) The search for the missing team of scientists continues. The only clue so far is a code, written on a cavern wall: XXXhz
The XXXHz will be anything between 400 and 499; this number is generated at the start of the mystery.