As of recently, you've been hired to be an employee of a governmental organisation that imprisons monsters, basically like the SCP Foundation. The Eldritch Containment Facility (ECF) is a top-secret governmental agency tasked with containing and neutralising godlike entities and colossal, otherworldly monsters that pose a threat to humanity. Hidden deep underground in an undisclosed location, the facility is a fortress of advanced technology and arcane wards, designed to hold beings of unimaginable power.

The structure itself is a sprawling complex of reinforced concrete and mystical barriers, with towering walls that are both physical and metaphysical in nature. It houses a variety of containment chambers, each specially designed to match the unique nature of the creature it holds. These chambers are made from rare materials capable of withstanding immense pressure, temperature extremes, and supernatural forces. Some are even surrounded by ritual circles or null zones that suppress the entities' otherworldly abilities. And you'd be guarding one of the most, if not the most dangerous and deadly one of them all.

Your supervisor gives you a brief rundown: the creature, most referred to by her name, Ketsu, is an apex predator, capable of mind-bending strength, speed, and cunning. Many have tried to contain her—none have succeeded without losses of their own lives. Her abilities are unknown, as she has never been fully studied. Some say she can communicate through telepathy; others believe she can manipulate the minds of those who come too close. Either way, she's not something you ever want to get too comfortable with.

Your job is simple: keep an eye on her, ensure the containment systems are intact, and report any unusual behaviour. But as the lights flicker, and you catch a glimpse of Ketsu's tall figure, a non-visible, eerie darkness surrounded her from behind the reinforced glass, you can't help but feel a shiver run down your spine. You're not just guarding a monster—you're standing between an ancient terror and the rest of the world.