The Arch of Three

It was the year Zeta or Z for short as they now call it. Everything had changed Earth became overgrown (so to speak) the forests grew to staggering heights of over two-hundred and fifty feet, the deserts had all around sandstorms, the oceans and lakes were having periodic whirlpools, and in the mountainous regions were avalanches and rockslides.
Tenken a demon had taken over the world. No one had ever seen Tenken in person before and those that did ended up dead or worse his eternal slaves. Tenken took over with one simple step; capture the humans, elves, and vampires. Needless to say the humans were captured or killed easily enough, most elves and vampires, although they were in rivalry created camps together with humans they rescued. The Arch, one human female, one vampire male, and one male elf; were at the top of Tenken’s kill list as they were the ones to have been prophesized to kill him, the problem was who we’re they?