SCP Class Keter, what kind of class?

Keter is the highest and most dangerous class of the SCP (Secure, Contain, Protect) object classification system. It is used to describe objects that are deemed too dangerous and/or too difficult to contain. These objects are often highly unpredictable, and their containment is considered to be almost impossible. Keter objects are usually capable of causing widespread destruction and/or pose a serious threat to humanity or the environment. Examples of Keter objects include entities that are capable of manipulating reality, objects that can cause catastrophic events, and objects with unpredictable and uncontrollable behavior. Keter objects require a great amount of resources and personnel to contain and are usually considered a priority for the SCP Foundation.