I think previously it only dropped if you fought at the Blight Boar concert with a class that could equip the item, however… Since we had transmog changes to allow any class get any item (for the appearance), I wonder if it’s worth trying to get it on my Warlock.
The class itself cannot use the 2h mace obviously, however, the Felguard can thanks to the Glyph of Felguard and that’s why I’m interested in it.
I actually have the appearence (dropped once on my DK) but sadly there’s no way to send a 2h weapon transmogrified to my Warlock.