Ok, I'll give a list:
1
8.Shelob (and Ungoliant)- Huge, dangerous spiders, ok? One managed to suck the light out of a Vala's greatest work. You get the picture...
7.Tol-in-Gaurhoth + Vampires-Horrible- trapping spirits and putting them in animals.
6.Silent Watchers- The reason is in the name, and also in the effect they have on others
5.Sauron- Not in LOTR, but everywhere else he is quite terrifying.
4.Baldor's death and the rest of the paths of the dead- I happen to find that sort of thing scary. I almost put this much higher.
3.Barrow-Downs (and wights).- When I first read the book, I really liked Tom Bombadil, but didn't really want to reread this chapter. All that darkness, and cold stone, and cold metal. Even the fungus is probably afraid to go there (or has died too. And the wight (I mean white!
*) clothes.
2.Nazgul- All that following and distant shadows really scared me. After the attack they are slightly less scary, but still higher than the stuff behind them.
1. The things like Ungoliant and Tom Bombadil that aren't named. Put Nameless Things in that category too. I don't know if they are the same- Could be anything.
*You know I actually
did write wight instead of white.