This music bears only the slightest of resemblances to death or black metal, with mostly light and airy, major-key melodies reminding me principally of Mozart, with some Germanic medieval and folk music thrown in. Occasionally there are gruff vocals, which may inspire the attribution of "death metal," but the vast majority of the music here is quite far from that.
The music is also very well done, with the jaunty nine-minute title track being a principal highlight. The "classical" parts come off as genuine, with a melange of real strings, woodwinds, and piano (and a french horn), unlike some classical-metal fusion bands who use mostly synthesizers (*cough* Rhapsody *cough*). The music sounds highly "organic" as a result. If you enjoyed Therion's latest album, especially instrumental tracks like "Flight of the Lord of Lies," you should check out Haggard immediately. The only possible complaint is that the ponderous metal guitar riffs aren't particularly inspiring, but I think they are there mostly to set a "heavy" background, in the way that a bass guitar is typically intended to do.