The White Walkers, also known as the Others, the most fearsome creatures next to dragons that bring cold wintery death with them where ever they go. Their shrill screams bring the dead with them, massive walls were built to keep them out of Westeros. And the first person to kill one after eight thousand years was none other than Ser Piggy, the Lord of Ham himself, Samwell Tarly of Horn Hill!
Take a moment and appreciate that fucking poetry!