World invasion was a rather unfamiliar term in the Red Heaven Realm era, but it was not nonexistent.
During the era ruled by the King of Manifest Realm, there had also been talk of world invasions. It was just that the target of the invasion had been the Manifest Realm, and it was a necessary step toward killing the King of Manifest Realm.
By the age of the multiverse, world invasion had become a true crossing between worlds, rather than a domain constructed by the King of Manifest Realm.
Generally speaking, only invading the 'Opposing Universe' counted as an invasion. Even the 'Marginal Universe' did not qualify.
The Marginal Universe had already been incorporated into the rule of one's own universe. The difficulty of invading it was greatly reduced. One's power would merely be suppressed, without any danger to one's life.
Yun Ye had set out from the Primordial World and crossed the void, heading toward a world no one had ever visited before. He had ultimately descended into the 'Opposing Universe,' making his actions the clearest possible example of a world invasion.
A beam of light descended onto the boundless black ocean without causing the slightest ripple.
"Cough, cough, cough..."
Yun Ye stood on the surface of the water, coughing incessantly.
This was the Opposing Universe. No Grotto-heaven Master had ever invaded it, and its laws were completely incompatible with those of the Red Heaven Realm.
Under such circumstances, what state would an invader be in?
Everything he saw was distorted and dark.
Everything he breathed was deadly poison.
All he felt was chaos and nothingness.
In such an environment, an ordinary person would be killed in the blink of an eye. One had to at least reach the Venerable Position and obtain the authority of a world before