[Old Teufel Hunden]

"Winter is Coming"

Correction. After last night's episode, I think it's fair to say that Winter is here. Dragon's glass and Valayrian Steel (from the lands the Targaryens ruled) seem to be the only thing we know that can kill white walkers. If you recall, the Targaryen's sigil are three dragons, Dany is the mother of dragons. I think it's very obvious that Dany is going to be at the wall. She's the only one with her dragons that can ultimately defeat the white walkers.

After defeating them and saving the seven kingdoms, that is her path to the throne.

[Zuben Elgenubi]

Dragon's glass and Valayrian Steel (from the lands the Targaryens ruled) seem to be the only thing we know that can kill white walkers.

Very true. Also remember that the Army of the Dead can only be permanently killed by fire, otherwise, they keep resurrecting. Seems that would be a rich target environment for the drrragons (three r's).