Secretum Secretorum is a split album between ANCIENT MOON and PROSTERNATUR. For their half, ANCIENT MOON deliver an 18-minute epic that builds slowly and ominously before exploding into a tensely buzzing hive of nightmarish black metal. Hypnotic yet free-flowing, somehow making time stand still and move in reverse, the song imparts an absolutely spellbinding mysticism that could be a whole record unto itself, its movements and fluctuations sublte yet profound; this track simply demands repeat spins, and eternal thralldom. For their half, PROSTERNATUR render three tracks that are impossibly vast for their six-minute average length. And indeed, PROSTERNATUR are a complementary fit for ANCIENT MOON, in that this shadow-cloaked trio conjures their own brand of black metal mysticism. Viscously thick yet somehow emitting a near-cosmic sense of space, PROSTERNATUR burl forth with a constantly churning density that's expertly laced with all manner of beneath-the-surface color and shade. Together, both ANCIENT MOON and PROSTERNATUR beckon the listener to let loose the bounds of reality and step into their Secretum Secretorum...