2015's Luminiferous is a nine-track venture into the signature sky-shredding riffs of Matt Pike, pummeling bass work of Jeff Matz, and hellish gallop of Des Kensel, the unequivocal culmination of the band's characteristically unhinged yet entirely focused savagery. Make no mistake, though. This is not some casual revisit to formula for the Oakland-based trio. Building on those tendencies of its predecessors, Lumifierous finds Pike at his most vocally daring yet, infusing the explosiveness of sound with his melodic but no less scorched vocal stylizations. Beginning with the whiplash rhythm of "The Black Plot," Luminiferous charges forward with abandon, only briefly slowing its churn with "The Cave," and its descent into a psychedelic and ethereal haze. Whether with the breakneck anthem of "Carcosa," the blistering thrash of "Slave the Hive," or the roaring sonic gauntlet of "The Sunless Years," Luminiferous represented yet another definitive stroke of heavy metal mastery for this inimitable band that's been breaking and rewriting the rules for years now.