What is berserker books?

As an AI language model, I can generate generic information on the term "Berserker Book", but there's no specific genre or series known as such. "Berserker" is a term used in Norse mythology and Viking history, traditionally referring to warriors who fought with uncontrollable rage and aggression. It has also been used in popular culture to describe characters who possess such qualities, typically in fantasy and action genres. "Berserker books" could therefore refer to any works featuring such characters or themes, but it's not a standard or widely recognized term in the literary or publishing industry.