Set in the frozen north of prehistoric Eurasia, approximately 40,000 BCE, Primeval: Phenomenon is a dark survival-horror RPG about the last remnants of a shattered human group confronting something older than life as they understand it.

After some unknown event kills their leader and destroys their community, a handful of survivors flee into a deep mountain ravine. Taking refuge inside a vast stone cavern, they struggle against starvation, freezing temperatures, cave lions, and enormous bears. Yet the mountain shelters a far greater terror. Deep within its ancient passages, they discover a presence beyond human comprehension: a primordial entity, one of the Great Gods of the Earth, known only as the Phenomenon.

It has no name because no human language was ever meant to describe it. It does not merely threaten bodies; it invades minds, twists memories, and transforms dreams into unbearable realities. Survivors experience visions of betrayal, murder, self-destruction, , and horrors that seem indistinguishable from waking life. Some see their dead loved ones. Others encounter versions of themselves committing unspeakable acts. The more they learn about the entity, the less certain they become that their thoughts belong to them.

You are one of the survivors. Your decisions will shape the group's fate as you struggle to distinguish truth from hallucination, preserve what remains of your humanity, and discover whether the Phenomenon can be resisted, understood, or destroyed. In this world, physical survival is only the beginning. The greatest danger may be the moment you can no longer trust your own mind.