What is something terrifying about your setting?

My main setting is fantasy, but I do have a sci-fi one I use for other games and stories.

We're used to energy weapons making noises due to sci-fi movies, but lasers are just light--silent.

A realistic battle using laser weapons would be pretty quiet...no more noise than flipping flashlights on and off. That is except for the screams of the wounded. And that is a terrifying thing to imagine--trench warfare that is quiet and still. Except for screams.