Riko and Reg begin climbing down the Great Fault, using a network of caves to avoid the flying predators that inhabit the layer. However, they accidentally stumble into a madokajack nest and Reg is forced to use his Incinerator to kill the madokajack. After narrowly escaping the crimson splitjaw that had previously been wounded by the Incinerator, Reg falls unconscious, leaving Riko to fend for herself. As Riko drags Reg along, she is lured in and swallowed by an amakagame and forced to cut her way out of its stomach. Riko is then forced to flee a swarm of neritantans and finds herself in a cave with an upward slope. With no other choice, Riko heads up the slope, suffering the effects of the Curse and experiencing various hallucinations. After reaching the top of the cave, Riko realizes how important Reg is to her as both a friend and protector. Reg wakes up just as the crimson splitjaw returns and he is able to fight it and chase it off. After making camp, Reg realizes that he can now see the Fourth Layer, the "Goblet of Giants".