Demonology

Demonology was the systematic study of demons.

Many Watchers possessed extensive knowledge of demonology and used it to their advantage against demons and vampires.

A related study is ethnodemonology, which focused on demon cultures.

Known demonologists

 * Harriet Doyle
 * Rupert Giles
 * Wesley Wyndam-Pryce
 * Angel
 * Warren Mears
 * Ethan Rayne
 * Laura Weathermill
 * Anya Jenkins