Ezokin is a somewhat legendary Magpie sorcerer who haunts the eastern half of the Empire, who is a collector of various sorts of magical power.
He has been seen in:
Most recently, it seems you can't hurt him unless you have enough zhu to pay for the damage you do (if you're in li, it rounds up to li), and he can't be hurt by things he owns. Also, he can disarm you by paying you for your weapon when you hit him with it.
Also, he really hates Master Deng.