The title of the album is apparently a reference to the Brocken, a mountain in Saxony-Anhalt, Germany, that is traditionally connected with witches (Walpurgis Night), most famously in Goethe's Faust.
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Mephisto is also featured as the lead antagonist in Goethe's Faust and in the unpublished scenarios for the Walpurgis night, he and Satan appear as two separate characters.
There are also de facto half-day holidays (with some variation depending on employer): Twelfth Night, Maundy Thursday, Walpurgis Night, the day before Ascension Day and the day before All Saints's Day.
The album takes the form of a very loose concept album concerning witchcraft upon The Brocken (a mountain) during Walpurgis Night, and tales of witch trials in the area around the Harz Mountains in Germany.