Answer:
obscure, and apocalyptic manner, the future political history of Britain
Explanation:
In a later work, Vita Merlini, Geoffrey further developed the story of Merlin by adapting a northern legend about enchanter Merlin.
I am not really sure that I know what the answer is.
"deer in headlights" is an idiom.
"like deer in headlights" is a simile, the word "like" makes it a simile.