Gargantuan Fossil

This skeleton is enormous and ancient, approximately three million years old, found in the Bone Fields. The skeleton belonged to an eel-like, Leviathan Class super-predator dwarfing both the Sea Dragon Leviathan and Sea Emperor Leviathan, despite only being around one third of the whole skeleton. The remains consist of a huge, reptillian-esque skull and sixteen pairs of huge ribs. The skeleton is covered in flora and coral. The skull is so large that a Cyclops can fit inside its jaws. Smaller versions of its ribs can be seen in the entrance to the Lost River Junction. There is also a smaller variant of this creature's skull which can be found in the Ghost Forest. The complete specimen would have been an estimated 1200–1500 meters long.

The Precursors were also studying these remains, as evidenced by small, angular indentations on the ribcage. It is possible the Disease Research Facility was set up to study these remains, given the facility's purpose and being the only base in the region.