Originally Posted by Ayumi
There's a recipe to create a staff (Staff of Herding) you need to enter the level.
You can do this on Nightmare, Hell and Inferno.
You can read about the items and the level here:
Staff of Herding - Diablo Wiki
Edit: If any of you are on US, I'd be happy to take you there!
Recipe drops from normal mode Izual.
The Nightmare, Hell, and Inferno recipes can be bought from the Nightmare, Hell, and Inferno mode vendor in Act 3/4 (respectively). He's the one by the Healer/Armory.