The album opens with 'Indoctrination', a furious song which immediately sets the tone for the entire album. This is blackened death metal, brutal and technical, complicated and chaotic but always intense. Most of this song, and the rest of the album, drives on blast beats, highly skilled riffing and guttural vocals. The tempo is murderous and in some bizarre way the songs seem longer than they actually are. That's probably because of the immense amount of variations in tempo, riffs and ferocity.
'Abomination' goes even further, partially nudging towards grindcore and old school death metal. Needless to say that this is one intense work of art and we're not even through the first half of the album. Fact is, basically the other songs issue the same elements of technical blackened death metal, something that might sound a bit negative, coming from a reviewer. However, since the quality is very high, the album remains enjoyable for the entire duration.
That duration is about thirty minutes and that's quite enough for this crushing kind of music. As I said, Heresy is an excellent extreme metal album, immediately grabbing your attention and dragging you in a whirlpool of intensity and ear-punishment. Undoubtedly, many death metal fans will adore the works of this Sardinian quartet, especially if they can keep up with it on stage.