User Summary: The Prison Passage Adventure Pack is part of Caverns Deep! Adventure packs contain unique terrain pieces specifically designed for their encounter area, unlike the core packs which contain the most commonly used terrain pieces. The Prison Passage Adventure Pack contains unique pieces for Prison Passage Encounter Area. It is made of "Dwarvenite" and includes some metal and magnetized parts. Some parts have LED circuitry (switch, battery, and socket) to support LED lighting attachments. This item was initially available as an add-on for the Build Your own Cavern pledge level or included in one of the other pledge levels during the Caverns Deep! Kickstarter. The item is available in painted and unpainted versions. Prison Passage Adventure Pack comes with these 9 pieces: (1) Magnetic Wall Insert (1) Open Arch Wall Insert (1) Hidden Nook Wall Insert (1) Wooden Portcullis Insert (1) Mercer the Prisoner (1) Magnetic Chained Crystal (1) Boarded up Opening (1) Alchemy Kit (1) Mushroom Cluster Small