Since the Mistlands update, you have to be careful of their knockback. Unless it's been patched, you can end up creating a grave marker at the bottom of the mountain if you get hit too close to the edge and get hit.

I think that was my first death after the Mistlands update. I wasn't even fighting the golem. I was just working my way around him and got too close. He hit me in the back, and next thing I know, I'm flying without wings!