The space crack behind Varian continued to expand. Unlike before, the aura of a Sovereign creature fully began to leak from the other side and a heaviness filled the air in this core region.
The giant turtles slowly opened their eyes and glanced at their master. They were as old as this world itself!
When the Primordial Gods realized this world was a success, they've put up the Turtles as a guardian for it.
Of course, for their own entertainment and experimentation, each god created their own playground.
Primordial God of Life & Death created the Twilight Zone. The experiment was to throw in all sorts of beasts and keep them in a cycle of endless reincarnation.
To keep the toys from escaping, the boundaries—the 'turtles'—were created. And to keep the boundaries from getting old and dying, the Primordial God allowed them to draw vitality from his power.
That's the reason these creatures could keep living even for hundreds of millions of years.