Legend has it, the Aeon of Preservation, Qlipoth, is the oldest Aeon. Silent and mighty, Qlipoth built a light-years long barrier around the galaxy, never engaging in any trivial conflicts or badgering with the other Aeons.
Civilizations across the galaxy speculate on the motive of Qlipoth. One said the ancient Aeon foresaw a disaster that could obliterate the galaxy, so Qlipoth built a barrier to protect the worlds; one said Qlipoth was willing to slave for other Aeons and was ordered to build walls for them. There is no way to verify the truth, but Qlipoth's tireless actions moved the mortals. They spontaneously gathered in groups to build a barrier to protect their planet. Some Architects have claimed to feel the protective gaze of the Aeon upon them. They liken it to a gaze of approval, tinged with the warmth of the forge and the smell of lime.
The annihilation of a single star can devastate planets thousands of light-years away, pushing them to the precipice of extinction. On rare occasions, worlds are saved only by the walls their denizens have built. People who survived their demise no longer mocked the stubbornness of the Architects. Instead, they joined them, never to question their motives or meaning of Preservation ever again.