User Summary: The Prison Passage Core Pack is part of Caverns Deep! Core packs contain the most commonly used terrain pieces, unlike the Adventure Pack which are unique pieces specific to an encounter area set. The Prison Passage Core Pack the basic cavern pieces for Prison Passage Encounter Area. It is made of "Dwarvenite" and includes some metal and magnetized parts. 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 Core Pack comes with these 13 pieces: (1) Straight Wall (1) Diagonal Wall (1) Cascading Pool Corner (1) 1x1 Straight Wall (1) Swell Wall (2) Flat Floor (1) 1x1 Floor (1) 1x2 Floor (1) Straight Passage (2) 45° Turn Passage (1) Widening Passage