Keep thinking the valerian swords will play significant role in final fight with the undead or maybe survival?? In ep2 they show what happen to Tarly Family sword and who owns it now. Ep 1 shows John Snow showing the valerian sword gotten from general Lord Commander Mormont to Arya. There is another valerian sword own by Brienne (or Sir brienne) given by Jaime lannister, havent mentioned yet in this season maybe in future episodes?? and not to forget the valerian dagger with Arya.