In His Element

It took them four days to reach the designated area, which was a bit longer than Sunny had expected. His estimations had not accounted for the torrential flood that drowned the Hollows, turning the vast subterranean jungle into a darkly beautiful land of abundant rivers, deep lakes, and overgrown vermilion islands. 

Great pillars of pale light poured from above here and there, illuminating the wet foliage and the glistening surface of flowing water. 

The flooding had caused the entire ecosystem of the Hollows to come alive. Many weaker Nightmare Creatures were forced to flee their dens and lairs because of the flooding, migrating to elevated ground in search of safety — there were fearsome predators lurking in the water, having waited a long time for the chance to hunt and gorge themselves once again.