Okay Im seriously of the opinion that the drop rate for this particular piece of armor is some how not the same as the others. It seems ridiculously rare for it to drop either from the boss or from the 4th to last chest, and I've done this dungeon so many times it has to be up in the late 20s early 30s, that's not something that should be necessary for one armor piece, to put it into perspective i've almost collected every other piece of armor in the place save for the pieces i really dont want and elect to pass on, that includes the historian set, the outrider set, and the chaplain set. I have all but the body armor from the Knight set, and with the exclusion of the Knight's Ring I want for nothing else, but the drop never seems to come, and i've gotten the other pieces within 3 to 4 runs. This is crazy, im not lv 55 almost 56, and im sure i could have gotten a better chest piece by now but i might as well get this for the glamor and the rarity of it, it seems.