epistolary (en)

written as a series of documents: letters, diary entries, newspaper clippings and other documents

Manichaeism (en)

an ancient religious movement that has to do with duality? "an elaborate dualistic cosmology describing the struggle between a good, spiritual world of light, and an evil, material world of darkness"

Visigothic (en)

(noun) a member of the western division of the Goths (nomadic tribes of Germanic peoples known for invading various parts of Europe)