From the back of the Starter Box:
We, the Padishah Emperor Shaddam IV, are greatly concerned with the war between two of our greatest Houses. We herewith command that you shall intercede upon Arrakis and ensure our will is executed. You are granted the right to act in our name. Abuse this great privilege, and you shall suffer our wrath. Perform your duties well, and we shall grant you a seat in the High Council.