A quasi-conceptual album centered on Wakeford's feelings of a declining London ["London was once the apex of an empire but it is now the playground of other empires that have superseded it."], "Necropolis" could be called a eulogy to England's capital. Sol Invictus titled the record after The London Necropolis Railway, a railway line that has connected London with the Brookwood Cemetary since 1854. But the moniker is also a nod to Wakeford's perception that the town is now "a London of mausoleums and masonry" and "a city haunted by the customs and crimes of the dead and the living."
"Necropolis" features guest guitar from Don Anderson (ex-Agalloch, Khorada) who previously lent his skills to Sol Invictus' 2014 release, "Once Upon A Time". The group around Wakeford continues to explore the psychedelic side of dark folk, using acoustic guitar as a foundation enriched with piano, flute, violin, electric guitar an drums among other instruments and – for the first time – the singing of The Green Army Choir.