"If the friction is severe and the contamination rate reaches more than 10%, then the inter-world rifts will become very frequent... In cases of severe inter-world friction, it's possible that the worlds could tear open 'rifts' which temporarily fuse together, causing a 'weak overlapping phenomenon'. During such times, the contamination rate can surge above 30%."
"After weak overlapping occurs, the physical laws and principles of the current region can change due to the overlap with the otherworld... There's also the possibility that creatures from the otherworld could come through the 'rifts' to our world."
Xue Jing suddenly said, "Is this the process by which Intersecting Boundaries are born?"
Void Blade shook his head, "Yes, and no."
"Intersecting Boundaries are the result when the contamination rate reaches 100%. They are not of the Current World, nor of the Otherworld; they are something born from the fusion of both worlds... There's another term for it, 'Subworld'."