Is a syndrome that results after exposure to a stressor of extreme magnitude, marked by emotional numbing and other symptoms, such as hyperalertness, sleep disturbance, or impaired concentration.

Post Traumatic Stress Disorder

Explanation:

According to my research on studies conducted by various psychologists, I can say that based on the information provided within the question this syndrome is known as PTSD or Post Traumatic Stress Disorder. Like mentioned in the question this is a disorder that is characterized by failure to recover after experiencing or witnessing a terrifying or horrific event.

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they all focused on themes about the inevitability of death.

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there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.