This is the Match:2018 Triangle Contest entry, it's a Sci-fi Short story.

The world as humanity knew it was gone. In its place was a radioactive wasteland, scorched by nuclear furnaces. The third millenium passed unmarked and uncelebrated by those in the safezones. The rich took to the oceans, and to the skies, leaving everyone else behind. Stranded in the isolated "safe zones", with no knowledge of the worlds above their heads. Igor Jonovich changed everything. Nanotechnology, long thought to be impossible, flourished under his genius. Even as the walls of their radioactive cage closed in, humanity pushed back, harnessing Jonovich's creations to explore the radioactive wastelands. To challenge the twisted creatures that lurked in the ashes of their former glory. Humanity thought they, at least, knew this scarred earth. It turns out even that was a lie. Yesterday Jared found a message hidden within Professor Jonovich's greatest work that changed everything.

Thousands of years ago, one of Sherath's distant ancestors refused to take on a quest. The task has to be done - it's vitally important - but nobody knows exactly what it is. Their race is dying out, and time is running out; and until Sherath comes into his full powers, he can't do it anyway. They have been waiting three hundred years for the saviour spoken of in an ancient prophecy to lead them on a long journey to adulthood and open the doors for them. But their saviour, and the key to success, turns out to be a volatile teenager from modern-day Earth. Sherath has hundreds of years of education in how to use the Power he will have as an adult, with little access to it as yet. Farinka, on the other hand, has access to vast amounts of Power, but no training in how to use it, what can and can't be done, and what is dangerous to try!