It's bugged. The ghosts that are spawned by carrying it spawn too frequently.
Not only that, but some kid named Beardius sat there and spawned all of those on purpose, Idk how he did it, but he would walk around looking like he was crafting something and he'd keep getting a "haunted" debuff. Pretty sure you aren't supposed to just be able to keep clicking it to mass spawn them, but he thought it was funny and was trying to lag/crash the server.
Cant u just remove those? Its damn hilarious, cant move in Stormwind at all. Feel like I'm playing on some custom Anus-Wow server where kids spawning mutant stuff all around the place