Fear



Fear is defined as an unpleasant emotion that leads people to believe that someone or something is dangerous, or may be threatening, or it could lead to possible pain. Many scientists believe that someone would be put in a certain kind of stimulus that when the threat of danger arises, the person would try to find any way possible they could to get out of that situation. Because of this concept, many villains use this unpleasant emotion to their advantage whether to ensnare their victims, or to manipulate further to a dark end.

Phobias

 * Coulrophobia- A particularly well-known example of a phobia, it is the fear of clowns.
 * Kopophobia - Fear of exhaustion. Otherwise known as "'Lexicographer's Curse'".

Nightmares
A nightmare is defined as a dream that can lead to a huge response from the mind whether through fear or horror, or sadness, or anxiety. Many nightmares range from the fear of dying or of a loved one dying, the fear of drowning, the fear of loneliness, or even the fear of appearing naked in public. As such, many antagonists mostly use their powers to cause nightmares, or to manipulate their victim's dreams. One example of this is Freddy Krueger, the legendary undead serial killer with a glove full of claws. He goes into his victim's dreams, and he is able to manipulate their dreams, and he would ultimately kill them while they are all still asleep. If anyone were to die in the dream that Freddy was in, then they would be dead in real life as well.