Inferno is a band with quite some history and Gnosis kardias(Of Transcension and Involution) is their seventh album. I have to admit that I got to know Inferno with this record and thus am in no position to compare this record to its six predecessors.
What I can say about this album is that while the music on here still clearly has black metal roots, Inferno added quite some progressive (meaning, from the progressive genre) influences. The songs use the tension between the black metal feel and the progressive, even dreamy passages to keep your attention and draw you in. The overall mood of the album is, like you want from a black metal record, quite dark and depressing. You can listen to the complete record here.