The Rizen takes place in a top-secret military facility where a group of scientists and researchers have been conducting experiments with ancient occult rituals in an attempt to harness supernatural powers for military gain. However, the experiments go terribly wrong and unleash a malevolent force that begins to possess and manipulate the soldiers and researchers within the facility.
As chaos ensues and the military base becomes overrun with demonic entities, a young woman named Emily, who works in the facility as a low-level researcher, must band together with a small group of survivors to escape the facility and try to find a way to stop the supernatural threat before it spreads beyond the base.
As they navigate the labyrinthine halls of the facility, they encounter twisted experiments, possessed soldiers, and otherworldly horrors that test their resolve and sanity. Emily must confront her own inner demons as well as the external threats in order to survive and prevent the malevolent force from wreaking havoc on the world.
The group's only hope lies in closing the portal that was opened during the disastrous experiment, but doing so will require them to confront the very source of the evil that they inadvertently unleashed. Will Emily and her companions be able to overcome their fears and doubts to save themselves and the world from the terrifying consequences of their actions?