Two years ago, Horror killed a house full of people. Last year, it was ripping the feathers out of Zelus and slaughtering a town. Now, not that I can't think of a way to surpass that, but I'm not really sure I want to. I was thinking, instead, of having Horror spread the love around a little more.
This year, she'd love to mess around with children. Whatever their fears, irrational or not, she will use them. Also, if there's any god who was a child, and still has lingering fears from their childhood, she'll use those two. Actually, she won't mind using anyone's fears against them to reduce them to a vulnerable, child-like state.
Horror has her chosen victims, of course, but she won't limit the fun. If anyone's interested in using this in some way, let me know!