The Witch Hunters was a military organization created by the Church of the Holy Light to hunt followers of the Four Gods. Adaen Melrache was their leader and was the right hand man of Bishop Thomas Marden.
In the Age of Men'heva, the Witch Hunters had been transformed into the opposite of their original purpose. They exterminated non-Pagans, especially Lightists. Queen Calia Yune Menethil organized a personal brigade of Witch Hunters known as the Scarlet Crusade.