From the publisher:
Fresh from the DarkStone Forge, we are excited to present the Limited Edition Doomsday Device and Generators Set! This set includes 3D versions of the Doomsday Device and Generators for Shadows of Brimstone that were first introduced in the Trederra OtherWorld Expansion. You DO NOT need a copy of the OtherWorld: Trederra Expansion to use this set. This set comes with the Doomsday Device and 3 Generators (all cast in high detail resin) and a brand new mission exclusive to this set! These stand out pieces are easy to paint and will make an excellent addition to your Shadows of Brimstone collection! We have very limited quantities due to the cost and difficulty to cast.
Admin note: it comes with a new mission, so it got an expansion entry: Shadows of Brimstone: Doomsday Device and Generators