Yes I believe so since it’s a true statement.
A definition of formal poetry is verse that A. STICKS TO CERTAIN TRADITIONAL PATTERNS.
Traditional patters may refer to stanza length, meter and rhyme patterns.
Examples of Formal Verse Poetry:
1) Haiku
2) Sonnets
3) Sestina
4) Villanelle
5) Pantoum
If the phrase <em>of the land </em>is underlined, then it would be an adjective phrase. This is because the whole place belongs to the noun <em>beasts - </em>what kind of beasts? (Those) of the land.
You are describing what beasts are like, which means that you are using an adjective, not adverb.