User Summary: The Erinthor Mountains is part of the Castle Builder System. It is made of "Dwarvenite". This item was initially available as an add-on to a pledge level during the Castle Builder System Kickstarter. The item comes in both painted and unpainted versions. The Erinthor Mountains comes with these 108 pieces: (2) Elder Earth Elemental (3) 8x8 Mountain Ground (6) 4x4 Mountain Ground (2) Earth Ramp - Right (4) Cliff Peak (2) Earth Ramp - Left (8) Cliff Rock Mound (8) Small Curved Cliff (8) Cliff Rock Base (2) Cliff Tree (12) Straight Cliff (6) Curved Cliff (12) 2x1 Elevation Block (8) Swell Cliff (10) Small Ledge (Cavern) (6) Inside Curved Cliff (2) Cave Opening (2) Cave Plug (6) Mountain Elevation Block