Endless Night

The night of the Wormsunder, the dragonborn learned of the death of almost the whole ancient dragonflight, and they charged against the nearby human lands with revenge in their hearts. They began to mindlessly slaughter every human they came across, completely overtaken with unimaginable bloodlust.

The Shepherd, seeing the danger his children were in, sacrificed an enormous amount of his power to save them. That night, which lasted for two days, saw the disappearance of almost every human in Nasria. When the sun came up finally, the human settlements were eerily quiet. The only ones who had been left behind were those touched by the divine and elemental planes. It was found out several weeks later that one human settlement in the north, Hargvost, had also been unaffected. All said, ninety-five percent of humans were gone.