What is "vampets"

In the Cirque Du Freak series, also known as The Saga of Darren Shan by Darren Shan, Vampets are mentioned as assistants to the Vampaneze, while Vampirites (introduced later in the series) are assistants to the Vampires. Vampets are human and noted for the tattooed V's on their heads. In the series, Vampets are quite the opposite of the vampirites and appear to be a large nuisance to the vampires. They also do not obey the same rules as Vampaneze therefore allowing them to use firearms. Vampets are first mentioned in the book Hunters of the Dusk and first appear in Allies of the Night and continue to Sons of Destiny.