Mother Boxes could be continuously manufactured. Unlike the Tesseract, which required the Space Stone to create, many Mother Boxes could be made.
Even so, Mother Boxes could not be made at will. As devices of the Fourth World, they could only be created by people born on New Genesis or Apokolips, and not even everyone could do it.
Building a Mother Box also required extensive training before one could be made.
Moreover, even those who created them could not fully understand the power of Mother Boxes. They had some sort of connection to nature.
All of this gave Mother Boxes an air of mystery.
This was also why Darkseid valued Mother Boxes. They were the only channel connecting Apokolips to the outside world. Apokolips needed the Boom Tubes opened by Mother Boxes to invade other worlds, while Mother Boxes scattered outside could likewise open Boom Tubes and allow enemies to attack Apokolips.
Of course, Darkseid had almost never considered that possibility. Apokolips had always been the invader, never the one being bullied.
So even after Steppenwolf found the Mother Boxes on Earth, Darkseid had not paid much attention. He did not believe Earth possessed the strength to attack Apokolips, and the Anti-Life Equation was far more important.
Under those circumstances, Ke Chen and the others hurriedly began their operation on Themyscira.
Mera was the king of Atlantis, so she acted quickly. Atlantis's Mother Box was immediately delivered, and when the two Mother Boxes drew close, their colors brightened slightly. Clearly, they were connected.
The Mother Boxes had originally been split into three. Once the three became one again, they would recreate the Unified Power.
How powerful was that force? If it was not used to open a Boom Tube, it could even tear Superman apart.
That was why Zeus and