Professor Barnsworth has been working on this new stardust - what with the fashion in Stormwind this season being about all things sparkly, I'm sure if we can get it to the market it will be all the rage! The Jewelcrafter's Association, however, won't let us market it until we've completed some humanoid testing - something about tinkering with magical dust being dangerous or some such nonsense. Well, I suppose we need to humor them. Take this bag and test out Stardust No. 2 on some humanoid subjects.
Completion
It did what!? We're ruined! Hmm. Well, actually... Maybe the professor can find some other applications for it?