Seems like it's nowhere. Item count in world is 0. Pity since it looks really cool, or atleast the inventory picture does.
And since you're on X-Box you can't use the console
That's no fun...
Well at least it's not that powerful. 1-44 ,1-33,1-4 and a value of 12000. Even the enchantment is only Drain Health 1-10 points for 30 seconds...
But it would still be cool to have it in my collection...