Once upon a time, there was a Pass of Demon Confinement.

Once upon a time, there was such a pass. Once upon a time, there was such a group of people. This pass was soaked with blood inch by inch. These people vowed not to return until death. All they wanted was that in the sea of corpses and blood, at the moment of lingering on the verge of death and when they turned around, they could see the twinkling lights of thousands of households behind them, and that there would be peace year after year.