WARNING: This section or article may contain spoilers!
The Void is said to be the place where The Court, which included Jack of Blades, the antagonist of Fable and Fable: The Lost Chapters, lived before man existed. The Court came to Albion from the Void, and demanded that the people bow to them. When they were refused, they brought great destruction down upon the land. William Black went into the Void, fought Jack and stole his sword, The Sword of Aeons. It is unknown how a mortal can enter this plane of existence, but William Black was pulled into it while reading a strange tome. Because of this, any information on how to enter the void lies with him.
The Void seems to have a poisonous effect on any mortal that enters it, as William Black was stricken with a wasting illness as a result of being present in the Void for a short period of time. Many years later, Black returned to the Void to try to remove this illness, which had slowly been corrupting him from inside. The remnants of the illness he left behind later became the Corruption. William himself was never seen again either, possibly becoming the being known as Scythe.