There is in the website http://www.bbc.co.uk/scotland/education/as/warsofindependence/index.shtml this sentence
"It was a time of heroes and villains, of battles and castles, intrigue and cunning."
I had checked that the word "intrigue" has no usage as an adjective, while "cunning" is an adjective. Then why the author does not use "intriguing" (or any other adjectives) instead? I mean, the pattern of the sentence is putting two "comparable" words together, for example "heroes" to "villains" and "battles" to "castles". So from any angle should "intrigue" not be replaced by "intriguing"?
Or is there any further consideration concerning usage so that "intrigue" is written down?