From publisher blurb:
Sinuous, powerful, and mysterious, these magic-wielding reptilians are a diverse lot. Nagas might be highly intelligent or nearly bestial, good or evil, monstrously huge or merely man-sized. They may have been divinely molded for a specific purpose, or are simply members of the larger monster community.
No single history speaks to every one of the various species. Some mythologies describe Nagas as guardians the gods created from whole cloth to perform tasks, or to bring suffering or succor to mortals. Other peoples believe themselves descended from the reptiles and worship them as holy ancestors. Whether divinity or evolutionary defines your setting’s Nagas, the creatures can make powerful allies or dreadful enemies for your player characters.
"Bestiarum Vocabulum: Nagas & Magics" provides you with detailed accounts of a variety of naga, as well as new spells and magic items related to these strange creatures.