The being named Kos, sometimes referred to as Kosm, was apparently revered by the Fishing Hamlet's inhabitants, who were also mutated by her cosmic power. Some theories say that she was washed ashore after dying by unknown means, and the villagers began cultivating the parasites within her corpse, altered by their cosmic nature. Others believe she lurked off the shore and sent the villagers innumerable squids and fish in return for their worship of her.

Kos is the source of the curse that overtook the College of Bergenwerth, transforming the surviving scholars into unrecognizable monsters and trapping the Research Facility inside an unending nightmare. It is unknown whether this curse is the reason why Lady Maria became the guardian of the Astral Clock Tower, or if she had her own reasons for doing so, but it is true that Maria was the last obstacle between the player and the Fishing Hamlet, where Kos's body (as well as her unborn son, the Orphan of Kos) are located.