What is this place?

Rean and Roan wanted to ask Sister Orb what was happening. However, before they could say anything, a huge wave of energy assaulted the group of demon beasts, humans, and Zasfins. It was so powerful that even the Transition Realm Zasfins and Stage Nine Demon Beasts couldn't fight against it.

Rean and Roan immediately braced themselves, preparing to fight against it with all their might. However, it was then that Sister Orb's voice echoed in their minds, telling them, [Don't resist. This is Higher Realm Energy, which no one in this place can fight against. The more you struggle, the worse it'll become. Just relax and wait and see what it's trying to do.]