The term "Void" has been used to describe both an omnipresent nothingness and a physical presence of some sort, responsible for the disappearance of the Percepi colony, which shall be called the Destroyer for the sake of clarity.
Many theories have been put forward by those with some connection to the Void. Noun has claimed that the Void is seeking out areas with high concentrations of mystic energy because the Void is the universe’s way of restoring equilibrium, and mystic energy represents a disruption of that equilibrium. Nikolai, who possesses certain Void-related powers, claims that the Void is attempting to destroy psionic intelligences that could potentially "go bad" somehow. However, no one knows for sure what the Void is, or what its true motivations are, if any.