The vacuum exists. It exists, though it has no content of its own.

The vacuum is, in truth, absence. And that is what gives it its power. It pulls everything into itself, because it seeks to replace. Whatever it touches, it distorts; the matter in its environment takes on an abnormal shape. Think only of a vacuum cleaner. In the spiritual life too, this phenomenon of the vacuum exists—we might for a time call it the "God-vacuum," or simply the Vacuum.

It is not good, not beautiful, not wise, not joyful. It gives no life, no fullness.

This Vacuum is capable of deforming the physical world. Wherever it drains away the vital force, there arises sickness and death. It cannot create anything new; lacking the power of creation, it only twists and corrupts what already exists. But it does not only deform the surrounding physical world. It has an even greater effect upon us, upon human beings. 

What more can I say—what is this? Or rather, who is this?

Where there is something, separation from that Something does not come about on its own. Even in the purely physical world, according to the law of increasing entropy, matter left to itself tends toward equilibrium. To produce a concentration of atoms in one place and a void in another requires energy.

It is the same in the spiritual world. A Vacuum requires a decision. We can create vacuums within ourselves; it does not necessarily take an external force. By our free will we have the power to detach ourselves from the primal Whole. 

But… what if Vacuums exist independently of us humans?  It comes to my mind Spot from the Spiderman. Isnt 't it amazing how similar the concept?

If someone takes the trouble to listen to any interview with an exorcist priest, it is chilling to realize that Evil truly is a person, and—lacking anything of its own—how it can force voice and movement through a human body.

Evidence?

The excerpt attached below comes from an official interview with an exorcist trained at the Vatican.

These priests are selected with a cool head; they specifically look for skeptics, men who will be the very last to concede that a case might be possession.