This was inspired by images of climatic battles at the end of the world between angels and demons. I also drew inspiration from "superhero" battles. You know the good guy battles a evil guy in a fight to save the world sort of thing. Superhero comics could be considered a modern mythology. Just as Greco-Roman deities are grounded in fantasy, so too are "superheroes".
The rhyme scheme is simple but also complex I think. I've trie my best to maintain a rhyme structure throughout, to the point of certain stanzas after stanza 1 flow into one another. I have used my own notion of poetic licence in this.