England’s Electric Wizard have cornered the market on stoner rock. Their singular dedication to the purity of the riff has made them the definitive post-Sabbath metal ensemble, and years of downtime and line-up changes hardly affect the outcome. This is guitarist and vocalist Justin Oborn’s world and things unwind at his pace. Which means very slowly. Oborn understands that flash and technique only blunt stoner rock’s primordial power, and he therefore strips songs to their core, knowing full well that repetition breeds added strength and weight. The opening title track spends nearly eight minutes bleeding every last ounce of its monolithic riff, before opening up to subtler textures for the follow-up, “Dunwich.”  “Raptus,” one of two instrumentals, scoots past at just a little over two minutes, serving as a break before heading into the eight punishing minutes of “The Chosen Few.” The 11-minute instrumental “Black Magic Rituals & Perversions: Frisson des Vampires / Zora” surprisingly skewers towards a progressive rock influence, but, again, it’s a set-up that makes the closing track, another 11-minute cut, “Saturnine” a cataclysmic wallop.