His Cave Heaven will be a physical object, so it should be able to carry physical things. But he is not sure that Fenrir will be able to accommodate his Cave Heaven at all because it is a physical object.
This uncertainty bothered him a little bit because it meant that he might not be able to carry his cultivation with him when he reverses time in the future as a divine being. But it was a side effect he was willing to bear if he could increase his lifespan.
As he was thinking to himself, he made sure to shoot down anyone who so much as rose into the air or reached the city wall in the opposite direction.
There were a lot of people doing this, and the two rail guns became insufficient to suppress everyone. So he created four more arms and turned all of them into Gatling guns.
At this point, he didn't care if they would die or not. He only cared if they would stay in the city or not.
