If you compare the price for what you get, the defence is way too high. As is the courage. Elves aren't scared of anything, yet they only have 7 courage. Maybe make it immune to terror but have lower courage or something, but don't make it autopass everything. Or maybe have it be immune to courage reduction, but have 6 courage.

That's actually pretty good. 350 is a little high, I would stick with the 10 wounds for that many points. For 300, it would be great.

You could use them like the spirits of Karna in the scenario from the original book.
I can't quite remember how they worked, but I think it was whoever had priority got to move them or it might have been whoever was holding treasure at the time was attacked by them or something.

What would a stone giant run away from? A Cave Troll with it's terror rule? I think C 8 signifies that they aren't human and don't really know the difference between what is a potential risk to them and what isn't. An Elf Lord wouldn't be scary to something of that size that doesn't understand what an Elf lord is. Why should their defence not be the same as Sauron?

A stone giant is...stone...near impervious to anything unless you have a squirtle or bulbasaur Have you ever tried hitting stone with a sword? doesnt end well for the sword or your arm

, have you ever tried hitting fire with a sword? Doesn't do that much.

glorfindel managed it

Here here! As did Gandalf.

I've only scanned through the profiles so far (I'll have a proper look through at a later date), however, one main thing stuck out to me - you gave Thrain a courage of 7, yet his special rule relies on him failing his courage test. I suggest lowering his courage to 5, which would still give him a relatively high chance of passing his test, but still leaves enough room for his special rule to come in to play.