I have been soloing them since I got to velious for faction. I was level 35 and never saw anything but blues. But sometimes they can hit pretty hard I had one hit me for 79 dmg but it was still con blue, also one of the only things I can solo, hehe so thats what I have hunted.
My roomate fights with me some times he is lvl 30 monk and most con yellow some red and rarely blue.
Hope I helped some.
Also they drop
a black steel wrap 6ac 10hp Uncommon
A spiked steel wrap 8ac 20hp Rare
-Jayden Breathtaker <Scales of Pain> Torv