There is going to be a horrible disease but I'm not sure how I want to identify it. If someone sees a bunch of dead bodies piled up on a cart and asks, "what happened here?" Someone would respond with "Plague." But I can't help but feel that that term is overused especially in fantasy/medieval works. But I'm not sure what to call it. I think it would sound odd if they called it an epidemic or something like that. Perhaps I could give it an actual name? The reason there is a disease is because demons are running rampant burning down entire forests andpolluting the air with smog and foul magic.