>>15843398'what he said
>>15843418also, they pretty much live in cold, and it's said that the cold comes with them. Steel weapons are just about ineffective on them.
Obsidian (also called dragon metal or something) kill them easily. But that's rare.
The Other were supposedly killed off by the humans over 8000 years ago, and that's when the Wall was erected to keep the north separate.
The Watch are there to pretty much fight them if the time comes, but since it's been 8k years, no one thnks the Other are still alive.