Graveyard Classics 2 (2004) was another cover album, this time featuring AC/DC tracks from the Back in Black era. On the next album, 13, Chris Barnes reportedly entered "a vision" from smoking large quantities of marijuana and meditating while writing the lyrics. A Decade in the Grave followed on October 28, 2005 as a five-disc box set. The first two discs were 'best-of' material, while the third was a rarities collection; the fourth was a live recording featuring band's first 1995 concerts back. The set included a live DVD from 2005.
November 2005 saw Chris Barnes joining the Finnish death metal band Torture Killer as lead vocalist for a side project.
Commandment (2007) and Death Rituals (2008) would follow; 2008 also seeing Barnes parting ways with Torture Killer.
Graveyard Classics 3 would arrive in January 2010.
2011 would see Butler leave to join Obituary; drummer Greg Gall would soon follow. Later that same year Rob Arnold and Matt Devries (both ex-Chimaira) joined Six Feet Under. However, soon later, in 2012, Devries left to join Fear Factory and was replaced by ex-Brain Drill 7-string bassist, Jeff Hughell.
Undead (2012) and Unborn (2013) followed. In 2013 guitarist Ola Englund and drummer Kevin Talley departed; Marco Pitruzzella took over on drums.
After Crypt of the Devil (2015) longtime guitarist Steve Swanson left the band and was replaced by Cannabis Corpse member Ray Suhy.
Graveyard Classics IV: The Number of the Priest (2016) followed as another covers album featuring varied artists.
Torment (2017) and the EP Unburied compilation (2018) followed.