What could some potential strong cursed spirits be!

Like the disaster curses come from negative emotion or fear of forests, oceans, volcanoes, ext. but also mahito is the malice and negative emotions humans hold for each other.
I’m making some characters and a few of the ideas I have are;

- Cursed spirit of Storms / hurricanes and he is a living lightning formation who is the eye of the storm

This adds to disaster curses roster b it then I have some more abstract ideas like
- cursed spirit of death itself
- fear of the unknown
- cursed spirit of war (he would use spears and traditional wartime weapons as well as more modern ones)

I’m having trouble expanding on some of my ideas and I realy want some more ideas to use. So what are things that would make realy powerful cursed spirits.