An enhanced version of the album was released that included photos and info about the band.

Metal Blade released a limited edition vinyl version of Unhallowed on August 20, 2013 in honor of the album's tenth anniversary.

The songs "The Blackest Incarnation" and "Closed Casket Requiem" originally appeared on the EP A Cold-Blooded Epitaph and were re-recorded for this album.

The video version of "Funeral Thirst" begins with the intro track "Unhallowed".

All lyrics are written by Trevor Strnad; all music is composed by the Black Dahlia Murder