Welcome to Tempest Island

Humongous stone walls with scattered cavern holes come into view the moment they all retrieve their consciousness right after being engulfed by the Vent.

The Realm appears to be some sort of a fortress that takes shape of what seems like the inside of a volcano's caldera - a dropped surface crater. A body of water pools the ground beneath them, reaching just above their ankles. 

All nine of them take a moment to scan their surroundings, nonplus written over their faces. But even then, they try to pull themselves together as soon as they realize that the coast is still clear -

Either the enemies are silently lurking around them in secret or they're still unaware of their arrival. 

"Oh, I see..." Wes thought out loud, his eyes widening a little in enlightenment.

"This Realm is quite familiar. We're now probably at the lair of another member of the Congregation." 

"The Congregation...? Hal trailed off, turning to look at him with a raised brow.