Just for those who are always farming Brewfest, I've seen the dagger from the brewfest boss drop alot, and i know all the items he drops are not suppose to be able to be d/e'd. However, when i was hovering my disenchant mouse over the item i noticed i had the option to disenchant it. And what do you know, the Direbrew's Shanker (Direbrew's Shanker - Thottbot: World of Warcraft) can be disenchanted for void crystals.