DB, My hit on the triad: The cards on either side tell of pathogenic organisms. You are deep in a process of cleansing, and it's not easy or comfortable, but you are totally in it--it is not a half-hearted attempt, and you are divinely guided. You (as the central figure) are sandwiched between two manifestations of a heavy force (the number eight rules Saturn) both with tendencies to be malefic, both coming at you from different directions. But you are surrounded by protective forces. Where you dwell within yourself is both pure and purifying. I see the two outer cards (the pathogen ones) representing teeth on the left, and bone marrow on the right. Bacteria+teeth, virus+marrow. These two cards as manifestations of Saturn are keeping you isolated from the rest of the world-- so you can heal. Both their position in the reading and the hexagrams asoociated with them show fortifed perifery and a safe space for you within.