Free verse is a poetic form that does not use formal rhyme and meter. That is why it is free - it doesn't have to stick to these formalities.
This would most likely be logos.
Ethos deals with credibility, bathos is not a real concept, and pathos deals with emotions.
The answer is: adverb.
The phrasal verb bring forth consists of a verb an an adverb. It means to produce or generate.
A phrasal verb is the connection of a verb plus an adverb, preposition or both. Its meaning depends on the adverb or preposition that follows the verb. Furthermore, a single phrasal verb usually has more than one meaning.
