The set is pretty simple, especially for a Warlock set. The basic premise was just to mix purples, blacks, and red colors together for an interesting Warlock set. As a result, it kinda fits more with the Demonology spec (being that is used both shadow and fire damage). It also has a bit of a Dalaran influence, but that was more or less unintended.
The great thing about this set is that its all very easy to obtain, everything can be gotten without much trouble at all, although the shoulders are purchasable for Horde Warlocks only for justice points (fun fact: I originally had a gnome preview this outfit before realizing that).