Blood Beast is the fifth book in Darren Shan's The Demonata series and was released 4 June 2007.

In 2007, Blood Beast was nominated for the Nickelodeon Kids' Choice Award in the UK, but lost to Harry Potter and the Deathly Hallows by J.K. Rowling.

While exploring a tunnel that leads to a cave, Grubbs hears a scream behind him and turns to find Loch's lifeless body on the floor, blood seeping from his head.

Dervish explains that the cave is a potential doorway for demons to enter the human world and it is his responsibility to safeguard it.

Grubbs returns to school, and meets with the new psychologist, Juni Swan, whom he had previously met in Slawter.

When he returns to a human state, he finds that he has killed Bill-E's grandparents and legal guardians.