Snake

Snakes, parasites, deadly bats, huge spiders, and other monsters were common inside the cave. Emma was also certain that the thing lurking here was the enormous spider. Following the discovery that the spider's web was the same size as an ordinary man's arm,

...

When Riku and Emma heard a man cry for assistance, they were concerned. Something appeared to be restricting his mouth as he couldn't speak properly. At the same time, this man was fortunate since his screams echoed throughout the cave, allowing the two to hear him.

He gazed up, trying to figure out which of the several holes led to the exact spot where they might see Solomon. "Emma, we need to help him right now!"

Riku took a deep breath, his hands sweating, knowing that the monster who had stolen Solomon would kill him at any minute. The primary threats to them saving Solomon were Time, Decision, and Obstacle.