The Keter class is reserved for SCPs that are exceedingly difficult to contain, pose a significant threat to life, security, or normalcy, and exhibit behavior or effects that are unpredictable, highly dangerous, or poorly understood. These anomalies often resist containment, bypass safety measures, or demonstrate capabilities that challenge the Foundation’s ability to reliably secure them. Keter-class SCPs may be sapient, hostile, or capable of influencing their environment in ways that make permanent containment nearly impossible without constant oversight, specialized resources, or high-risk containment procedures. Some Keter entities pose threats on a global or even existential scale, requiring interdisciplinary cooperation and rapid-response protocols to prevent catastrophic outcomes. A Keter designation does not necessarily imply malevolence; rather, it signifies that the SCP is fundamentally unstable, uncontrollable, or capable of causing massive disruption should containment ever fail. Personnel assigned to Keter-class anomalies must undergo advanced training, maintain the highest levels of operational discipline, and be prepared to initiate emergency failsafe procedures at any moment. Interacting with or containing a Keter-class object is one of the most dangerous assignments within the Foundation—and one of the most critical to the preservation of humanity and the known world.