"Heh heh heh, Colin, if only you knew from the beginning..." it said, hinting at something Colin didn't know. All of a sudden, the ground disappeared and Colin blacked out.
As Colin was unconscious, he kept seeing flashbacks of certain scenes throughout Light Persona history. Sixty's death. Negative Zero being created. Keyan's death. Jayl Cel's death. Ancient carvings of a being with a head and two hands, watching over the land and the people, as they worshipped him...
The voice echoed throughout them,
"Death is my energy...and I command all that advocate using their power to bring about death for their benefit alone...death for the common good and the essence of good in general is enough to anger me...the Void started as a simple second world, but the power it held...well, I wanted it for my own...I created Void Personas, the ones who also want the Void power that I do..."
Colin, in his state of unconsciousness, understood finally. Jayl Cel was never the real enemy. Just as he is a human capable of wielding the power of the god, Clemethai the Light, Jayl and all the other extensions of Jayl's power; the other Void Personas (who were really sub-Personas in that sense) are under the control of this god, who spoke to Colin after years and years of staying hidden.
Colin awoke in his bed, in his old room, the castle intact and the fires gone.
"Was that all...a dream?" Colin asked himself. As he got up, the Void god's voice answered, as the castle shook, "NO, THIS IS REAL."
Colin ran outside, and saw the figure depicted in the ancient carvings. One head and two disembodied hands, with a grayscale color scheme. The figure was giant, one hand a bit bigger than the entire Grand Castle, and the head the size of a Void Core (a large energy ball that fuels the Void).
The figure spoke with the god's voice.
"Colin, in the past, Eric Four fought the Negative version of me, a smaller, more humanly-proportioned being with the power of all 4 Void Personas and sub-Personas that existed up to then; that would be Rukalor, Eight, Guyton, and Jayl. Now I stand before you, you being the strongest Light Persona in history, ready to end you and your god Clemethai, bringing an end to the light.
I am Zero, god of the Void."