hermetic (en)

(of a seal or closure) complete and airtight

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"

peroration (en)

(noun) the concluding part of a discourse and especially an oration / (noun) a highly rhetorical speech