This is a climate change/permafrost/disease story. Take a trip to one of the northernmost settlements in the world, Longyearbyen in Svalbard, Norway. They walk you through why it seems to be forbidden to be buried in this area because of the (now starting to melt) permafrost. The scientists interviewed up here discuss how during the 1918 Spanish Flu epidemic seven minors were buried atop the permafrost and their bodies likely have preserved the flu virus that triggered that epidemic.
I was working on a story recently (called Bittersweet) in which I have a near-future setting. In it, a plague happened that more or less wiped out a quarter of the population, and anyone who survived (Who are within that 25%) became infertile, gained electric blue eye colors, but could suddenly use magic. I made a petite pink-haired mage, but I realized something; I'd written the world for the sole purpose of making this character and disease, and not for a plot, and now I'm a little stuck.Help?