You just defeated Vam, that must mean Fantasian Neo Dimension is about to end, right? Ah, but it has only just begun. The Chaos Fields are the aftermath of your encounter with Vam, but that big ...

In the Chaos Lakes, you must summon the Apex Predator, the Chaos Serpent, as they drop the jewels in question. To do so, you must interact with each geyser around the area in the correct order.