It tells the Swedish outfit's story in the words of mainman Akerfeldt, his bandmates, their friends, former members and collaborators. The package - part of the band's 25th anniversary celebrations - comes with exclusive unreleased acoustic versions of Atonement and Demon Of The Fall that won't be issued elsewhere.

It will be available in two versions - a classic edition and a signature box set limited to 500 copies, signed by Akerfeldt and including a numbered print of the Pale Communion triptych by Travis Smith.

In the unboxing video, Akerfeldt recalls signing 500 copies of the limited set. He says: "I remember doing these, I had to do 500 of these...really boring. But they only come with the limited, deluxe version of the book. I signed it and numbered it myself. It's got pictures from pre-recording days, before we even had a record deal."