"Five make up the Void, and Four shall stand against them."
The void is the group of the five gods of the moon and their various avatars. Together they form the void, the definition of nothingness. The void was too chaotic to have things like agendas, weaknesses, or compulsions until The Thing that Shatters the Sky began to change them. In retaliation, they cast him into the World Calcified and continued to wreak their havoc on the moon.