The somewhat rare word has been used in literature by T. S. Eliot, C. F. Keary and M. McCarthy, and is Greek in origin, meaning "earthly", specifically dealing with the underworld and spirits.

In November 2011, The Chthonic Chronicles was reissued as a limited edition digipak by Nuclear Blast's affiliate label Metal Mind Productions.

The reissue featured an expanded lyric booklet, additional artwork and remastered audio.

In October 2020, The Chthonic Chronicles was reissued as a double-vinyl gatefold edition limited to 400 copies, under license to the Italian record label "Night of the Vinyl Dead".

In May 2022, The Chthonic Chronicles was reissued as a double LP gatefold edition via the UK specialist vinyl label Back On Black.