Let's See

Rean and Roan looked at Kentucky, who nodded back at them. Kentucky couldn't go even if he wanted to, so he could only believe in the twins. Darian did as he said and warned the demon beasts guarding the entrance of the Spiritual Energy Field's core region. With that, they turned around and left the room. 

As mentioned before, the entire conversation was through Spiritual Sense, so they lost almost no time during it. Rean and Roan didn't take too long to arrive at the core region's entrance either. It's just that all they could see was a white wall and nothing else.

"Is it really here?" Rean asked a demon beast by the side.

"Yes. If you're allowed to enter, this wall won't stop you. Otherwise, you'll basically hit your face against it." the Stage Seven Demon Beast that Rean asked explained.