It's not that Gao Ming holds grudges; he's simply curious. Based on the combat power displayed by Void Blood City, it's estimated to be just a notch below Blood. During the blood sacrifice, other Blood Cities merely did their duty, but only Void Blood City attacked the eye in the night.
Void Blood City seems to hate the Destiny Giant Tree more than other Blood Cities. It doesn't cooperate with Central Blood City, seemingly thinking that the ferocious gods of Central Blood City are still too conservative.
"I don't seem to have ever seen a ghost coming out of Void Blood City."
The Deep World indeed has a rule representing "nothingness," which is one of the thirteen rules. However, ghosts and monsters who can master or use this rule are very rare.
When Gao Ming was still a distance away from Void Blood City, he left the dream. It wasn't that he was unwilling to continue walking in the dream, but there were no ghosts near Void Blood City.
