The band's second full-length album, "Leviathan", was released in 2004. It is a concept album loosely based on Herman Melville's novel "Moby-Dick". The band received critical acclaim for "Leviathan" and the record was named album of the year by "Kerrang!" and "Terrorizer". "Blood and Thunder", which featured Clutch vocalist Neil Fallon, was chosen as one of the most important recordings of the decade by National Public Radio in November 2009, and that the entire album epitomizes " a phenomenal decade for metal". "Leviathan" also ranked second in a list by "Metal Hammer" of the best albums of 2004.