On Nightwing, the theme is blood, divided in two parts: The first in the satanic ways customary of Marduk's lyrics, but the second part tells the history of Vlad 'Tepes' Drakul, the Impaler of Wallachia who fought against the Ottoman invasion on Europe, giving continuity to the history started on "Deme Quaden Thyrane", a track from their third studio album, Opus Nocturne, and continued with "Dracul Va Domni Din Nou In Transylvania" from Heaven Shall Burn... When We Are Gathered. "Deme Quaden Thyrane" appears also here, rearranged, with Legion's vocals and a little change in the lyrics at the end.
The chapter to which the title track belongs is uncertain, as "Nightwing" is completely absent from the track listing on the back cover of the album, despite being track 5 on the disc. Probably it is an interlude between the fast blast-beat of the first chapter and the darker, slower second chapter.
An anticipation to the chapter "Warlord of Wallachia" can be found at the end of the Dracul Va Domni Din Nou In Transylvania lyrics, the #7 track in Heaven Shall Burn... When We Are Gathered. The last verses are not sung, but they say "Greater stories are yet to be told".
The introduction to the track "Slay The Nazarene" is a line from the 1973 film "The Wicker Man".
The main musical theme of the track "Nightwing" is a variation on the main musical theme recurring in the Subspecies films released by Full Moon Features.