Lord of Primal Fear

Extinction - the fear of annihilation, of ceasing to exist. This is a more fundamental way to express it than just "fear of death." The idea of no longer being arouses a primary existential anxiety in all normal humans. Consider that panicky feeling you get when you look over the edge of a high building, or when surrounded with darkness or while thinking about fatal diseases is the fear of extinction or the fear of death popping up, warning you about the imminent danger.

Previously other being, after completing her task of erasing everything that doesn't supposed to exist Tsar of Extinction now exists with the rest of the Lords of Primal Fears in a pseudo-neiro-electrochemistry-emotional layer of existence and like the rest of them is pure incomprehensible manifistation of their prior concept, in her case it's unconscious fear of Extinction. Doesn't really like to interact with others, even the rest of the LoPF.

Even though we can't fully comprehens their motives fully, i's can be said: We are protected by fear. It makes us more aware of the risk and more prepared to deal with it. In some instances, feeling terrified is quite natural and even beneficial. It can serve as a warning, alerting us to the need to be cautious. Fear, like all emotions, can range from low to moderate to extreme, depending on the scenario and the individual. Fear might be fleeting or persist for a long time. Fear can be triggered by real dangers, but it can also be triggered by hypothetical dangers. Panic disorder, social anxiety disorder, phobias, and post-traumatic stress disorder are among mental health illnesses that can cause fear.