They also had to make their own wig because the head is so insanely huge, but that won't be a problem for you, what with all that hair you no doubt have lying around your basement.
Spiral CatsAlong with fur, leather scraps, decorative skulls ... in retrospect, maybe it's just us with a basement like that.
The eyes are important too, because you want to use a lens with a pupil small enough to get that "your skull looks like Halloween candy to me" vibe. It's not an easy project, but there are tutorials that show you exactly how to make this suit, assuming you can adjust your WoW playing schedule to accommodate the time commitment.
Related: The 30 Most Unsettling German Halloween Costumes
Make It Look Like You've Been Eviscerated
So maybe monsters and demons aren't your thing, and you'd rather your friends think that you've taken a shotgun blast to the fucking stomach. Hey, costume fashion is subjective. What's important is that we finally get to talk about gaping holes without getting censored.