Sweden's amelodic maestros of extreme graph-paper metal are still obsessed with getting convoluted in a claustrophobic room. Most calculus equations are barely discernible to untrained ears, but it's instructive that this set starts with its most difficult track: the cold, staccato, defiantly unchanging "I Am Colossus." From there, a window lets in some light, and guitars spurt in the crevices. The bone-cavity textures of "Marrow" beget the vertebrae-cracking "Break Those Bones Whose Sinews Gave It Motion," which begets the raging beehive "Swarm." By "The Last Vigil," calm has set in.