For nourishment, they consume a type of black liquid containing all necessary vitamins and other nutrients. The Devannans have a weakness concerning their extremely sensitive hearing, with loud noises having a painful effect on them. As of the 20th century, this species had suffered a devastating nuclear war and was dying out from an epidemic disease which causes their blood to "evaporate". A Davannan agent was sent to Earth to study the effects of Human blood in their own biology, but after the alien died in a car accident, the planned invasion might have been called off.
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