Synopsis
Rémi Letam awakens in the custody of an unknown group who seek to interrogate him. Under the effects of a truth serum, Rémi admits to them that he joined the ON Peacekeepers as a pretext to sneak into his war torn homeland of Hadea to search for his parents. He then recounts events leading up to his capture.
Some time ago, Rémi arrives in the war torn country of Hadea, which is not only in the midst of a civil war between its Palomist and Sabinian religious factions, but also is infested with hostile supernatural creatures called Lymbic Entities. Rémi manages to scavenge weaponry from a fallen OMSIF military squad capable of fighting the Lymbic Entities and commandeers an abandoned APC. He then travels to his father Vitalis Letam's hometown of Jova, which is now under miliary occupation and besieged by Lymbic Entities. Rémi discovers that Vitalis was part of an enigmatic organization called Vigil that is aware of the existence of the Lymbic Entities, and had already left the village. Following his father's trail, Rémi finds Vitalis mortally wounded after a battle with OMSIF forces. Vitalis recognizes Rémi and explains he and the Vigil are sworn to protect Hadea and put a stop to the Calamity giving rise to the Lymbic Entities. He passes an item called the Keystone of Grief and bids him to find the journalist Tania Alver. Finally, Vitalis passes away, with his last words claiming Rémi's mother is dead.
Rémi links up with Tania, and they continue to investigate the Vigil, discovering that the Keystone is involved in a ritual called the Failsafe, which supposedly can stop the Calamity. Together, they comb Hadea for ancient ruins that may hold the answers they are seeking. Eventually, they find the door the Keystone of Grief opens, but they need three additional Keystones to open it. They also receive covert assistance from an OMSIF officer who allows them access to OMSIF's Ziel Server, which contains sensitive information about Hadea's history. Rémi continues his journey across Hadaea, searching more ruins and collapsing Timeloops in order to find the remaining Keystones. In addition to the ruins, he also comes across a secret underground OMSIF facility called the Auriga Museum where Lymbic Entities and Timeloops are being experimented on. The OMSIF officer then contacts them again, revealing that she is Aribeth Letam, Rémi's mother. OMSIF discovers her betrayal and attempts to apprehend her, which ends in her apparent death.
With all of the Keystones collected, Rémi unlocks the door leading to the Failsafe, which leads to a massive underground chamber containing a large white Sphere of unknown origin. OMSIF had already set up a lab to study the Sphere, but the entire research team was wiped out by a sudden invasion of Lymbic Entities. Rémi fights his way through the Lymbic Entities and activates the Failsafe, which collapses the entire chamber and drops the Sphere into a pool of lava below, destroying it. Rémi escapes the chamber but is captured by OMSIF forces.
Back in the present, the interrogator taunts Rémi that Aribeth betrayed Vigil in order to protect him and smuggle him out of Hadea, and OMSIF subsequently used falsified evidence to turn her against Vitalis. The interrogator then blames Rémi for destroying OMSIF's chances of making any scientific breakthroughs on their research of the Lymbic Entities, Timeloops, and the Sphere, with Rémi retorting it shouldn't come at the cost of meddling with Hadea's affairs. Aribeth then arrives and kills the interrogator, having faked her own death. She frees Rémi and escapes with him, promising to take him home.
In a post-credits scene, an OMSIF drone discovers another alien construct dubbed the "Eye of God".
