If you're trying to attain the Scourge Knight armor, it might be possible to get them from doing Barrenzin's quests as well. He's in the Plane of Knowledge.
i have been hunting these since level 8 i am now 10, and killed probably 100 of these very rare skells. guess what ??? they drop nothing but bone chips!!! please someone update this quest and find out whats wrong. thank you! :0