De Vermis Mysteriis (or "Mysteries Of The Worm") takes its title from a fictional grimoire created by psycho author Robert Bloch and incorporated by H. P. Lovecraft into the lore of the Cthulhu Mythos (Lovecraft mentioned De Vermis Mysteriis as one of the books that "repeat the most hellish secrets learnt by early man").
The band's second album 'Surrounded by Thieves' closes with the same drum-solo outro that opens up the third album 'Blessed Black Wings'.