I actually was farming different sets when i stumbled across this combination and fell in love with it at the first glance at it. What I am saying is that I did not actually farm specific items but the bow and randomly found this combination of collected items amazing.
As Rissdridin @ Aegwynn EU has found, a good set is often just a happy coincidence. Some pieces naturally flow together. This set has an industrial look, tied in with a noticeable Fel energy motif. The bow from Illidan Stormrage in Black Temple is matched by the sweeping horns of the helm, shape-wise. The theme is amazing, and it's even cooler that it came out of chance. :p
Whether you prefer to harness the elements, or send countless animals at your hapless enemies, this section is for you! Whips and chainlinks for all! :p