Definitive Hospital Productions artist Jim Mroz, aka Lussuria, follows duties on Prurient's Rainbow Mirror LP with a new opus worthy of comparison to his dank ambient classics, American Babylon (2012) and Industriale Illuminato (2014). In the foreboding Three Knocks, Lussuria creates supremely occult dark ambient with submerged black metal atmospheres using a Hawaiian flute made from a human femur, and an iron lung for percussion (don't ask how he accessed it). Together with operatic tape cut-ups and field recording, Lussuria limns an unconscious, near-death experience based on a tale told by his mother of her time in a medically-induced coma. She eventually came around, and recounted that her illness was preceded by three knocks at her office door, slow and heavy -- proposing that each knock was a mockery of the Holy Trinity; one knock for each crucifixion -- but when she answered nobody was there. Bleak. Highly recommended.