Though the dimensional passage between two worlds can easily be blocked or sealed, it could never be truly severed or destroyed.
Which was why Joshua and Roland did not panic when they noticed that the dimensional door was reduced to nothing by the light beam they encountered earlier. The holy knight sighed as he stared at the dimensional rift above the pool of magma. He shook his head and complained, "It seems that we are going to stay here for quite a while. If I have anticipated the thrill of venturing into an outer world, I would have brought my armor with me."
"I too have yet to fully equip my armor. Who would have thought that we would end up in an outer world tainted by the corrupted Chaos?"