The old man in the poisonous space

"Natural restriction?"
Ronin Austin's eyes lit up, as if he saw a glimmer of hope. Deep in this purgatory, there were invisible natural restrictions and formations in many places. They entered this devil's cave by entering a natural formation. If other natural formations appeared, they would have hope of escaping the pursuit of the War Spirit Realm demons.
"Walk."
How could Ronin Austin dare not be negligent at all? The giant monster behind him was extremely ferocious. Once caught up...