I hate to say it, but I just got in that category. I've cleared the raid once on normal, though have actually gone through it a dozen plus times without being the boss. Only thing I ever got from the raid besides materials has been the Revenge sniper rifle. I just found myself playing a hard save with a random group, all we had left was Atheon. I came prepared: max ghallarhorn, level 29, 4-shot special for the Hunter (I know, sub optimal). I was a default Oracle killer, blowing up that sob in the middle when I had the rounds. The glitch was strong tonight, and we wiped a couple dozen times. When we finally did win, which was a surprise to me since I was picking off supplicants, well, I get the Vex Mythoclast.