TheNightKing
J.A.P.A.N.
He didn't.I can't remember... when Jon was telling everybody in Kings Landing what kills white walkers and wights... I know he mentioned dragon glass and fire... did he ever bring up Valyrian steel??
What I found funny, is that when they are fighting wights they can punch them, stab them, etc. and they "die". But the one they brought to Kings Landing kept coming at them even though the Hound cut him in half and cut his hand off. He only "died" when Jon stabbed him with dragon glass.