But if we are talking in terms of Light beings, or beings of darkness this does not apply, since there was nothing in that original void, only there was something after the creation, the Fiat, which was Light and Sound and not Light and Darkness, as we are told buy the oldest esoteric traditions. The creatures or beings attributed to the darkness surfaced with the falling of the angels, whom were led by Lucifer, or the "Lighter". Another hint that Darkness do not actually exist. Therefore, what happens was/is a change in a state of consciousness and an attempt by the persona to disconnect from the Supreme Being, reflected in a state of illusion and disconnection we also live in.
We are not beings wandering in darkness wanting to find the Light, as taught in the Hermetic Order of the Golden Dawn initiation of Neophyte. We are and we will always be Beings of Light, the majority of us and other beings just do not have consciousness of that yet. In our case, our consciousness has being filtered by physical perceptions and so we learn not give importance to our psychic senses that would reveal our true nature.
Another aspect that we must consider is the level of consciousness and the dimensional aspects of the manifested Universe. The Kabbalah teaches us that are 4 worlds or levels of consciousness. Our perceived duality would be totally transformed with a brief insight in high states of Kether where we perceive oneness only.
So, what actually exists is Light, the rest is pure illusion derived from states of consciousness disconnected from the source.