Judging by its craftsmanship, it must have been stolen by the hozen. Jojo Ironbrow, upon failing to even crack it with his head, reveals that it must have originated from before the "first days of Shen-zin Su". This suggests it came from Pandaria well over 10,000 years ago. Jojo then takes it with him to use as his own personal weapon, and is currently seen carrying it around with him.