Looking to just get the necklace at this point, I've ran Darkshade 1 26 times in a row over the last 3 days and noone in a 4 person group has yet to receive it (or they wanted to keep it for themselves of course, but I kinda doubt that to a degree as it's not a meta set).
So, I Googled to see if I was crazy and that you can get it in Darkshade 1 (which it appears you can). That's when I came across the fact that Armor of Truth is sold in boxes in Vlastarus. So, I headed to Cyrodill and proceeded to take the flag at Vlastarus where the merchant sells armor. Low and behold, the Armor of Truth was not a set being sold.
TLDR: Is the Armor of Truth Set no longer sold in Vlastarus? I'm sick of running Darkshade over and over and not one in four people getting it.