It was an ordinary day in one of the countless universes.
However, even in this particular universe, there was but a single world—an immense celestial body stretching across the entirety of its universal bounds, with nothing else in sight.
This solitary world was known as the Yuantian World, a world that bore some resemblance to Earth, though its scale and mysteries far surpassed Earth.
On this day, in many corners of the vast world, the fabric of space began to shudder violently. The air twisted and tore apart as dark, swirling portals erupted into existence.
The natives of Yuantian World were quick to notice the phenomenon. But no one dared to be the first to step through, not foolish enough to do so.
One such portal manifested in a place of a sprawling residence that stretched across fifty kilometers.