It was another day where nothing happened. Day in and day out the Matoran labored in the factories below. They performed their work as mechanically as robots, all individuality and unique thoughts long gone.
It was just the way he liked it.
Oh, once every millennia or so, one of them would get a spark of rebellion. It was rare though. Even rarer still was when they rallied, attempted escape, or complete takeover of his realm. Any of those scenarios were unacceptable. Those that broke from the norm, faced the ire of Karzahni himself.
And fill them with dread he did. The vision he'd grant them would start off with them getting away. But upon escape their compatriots would die, one by one from the harsh and dangerous conditions of the Outside. Then the food would run out. The water and liquid protodermis would be wrought with salt and completely undrinkable. The sun would beat down, hard and unyielding. Flying rahi would swoop in and slowing pick and tear at the perpetrator's organic parts. Infection would set in. And they would die a slow, pain-filled death alone in a strange, strange world.
No, the Matoran would decide afterwards if they hadn't gone mad, it was much safer to stay here and work for their Master. He gave them shelter and the necessities of life. A job and companions. So long as they behaved, they would be safe.
It wasn't like he needed the Matoran here. He could probably train the Manas crabs to do all their work. But, as he would admit to himself in times of weakness, it would be lonely. His brother and he no longer communicated. Matoran had stopped coming to his realm altogether too long ago. If the ones still here left…
Such moments were rare and Karzahni would never admit to having them publically. He was the one who fixed broken Matoran. He had to be strong from those in his eternal care. Or more uprisings would ensue and it was a bitter annoyance. Any break in the routine was an annoyance. Annoyances were to be dealt with swiftly and ruthlessly.
No one would ever leave. No one would break the routine he'd worked so hard to achieve. No one would leave him alone.
Forever.