Hello all, its been a long time, but I've finished the book and now returned.
The champion, as Sword says, is an unGregor. That's a good description. I began calling it FrankenClegane as I was reading.
I think Brienne called out either Jaimie or Renly. or maybe Saphires. It saved her before. I've been mulling that one around for a week or so, and I don't know. The real question, was it a word that will save her, or is that the end of Brienne. I think Brienne is dead.
I think Arya's eyesight loss is a training thing. And maybe a little punishment. Not for killing him, but for doing something only Arya of House Stark would do. That is how the series begins after all, Eddard taking the head of a deserter from the wall. Arya's eyesight will return.
The difference between Others and wights. Wights are the animated corpses of the dead. Others are the magical spirits of winter who possess the power to animate the corpses, create unholy cold in their presence, and are wicked quick with an odd almost lightsaber like sword. I think the Others possess a number of ice cold powers as of yet unrevealed. When describing the Others, I've often used the phrase Ice Demons. So many thousand years ago the Others brought a winter that wouldn't end, the Heroes of that Age sought the Children of the Forest to fight them. Yada yada yada, plenty of that on other message boards and in the first 3 books. I don't know how exactly the Others are put down, but I do know where the final battle took place. The battle that vanquished Winter, where Winterfell.