"A horse, a horse, my kingdom for a horse!" This line is an example of meter from Shakespeare's play, Richard the Third. There is a rhythm to this language when spoken. It is written in perfect iambic pentameter because it has five iambs.
A Mythological Creature or The American soldiers are portrayed as beast-like.
It’s one of those
I sharpened my skills under the mentorship of my coach.
You need a noun to complete this sentence, and mentorship is the only noun here - the rest of the words are adjectives.