The Power Caged

The prison cage that Arthur was trapped in was neither big nor small—just enough to walk around and half the average human height. The majority of prison cages beneath Arthur were the same size as his, but some were bigger than the one he was in. 

Walking around inside the prison, Arthur carefully looked beneath. He saw a number of small and mid-sized goblins continually hanging around, monitoring the prisoners as well as checking for any unusual movement around the cave.