*rolling of the eye* TECHNICALLY, they're omnipresent. They can go wherever fear exists, even other Superdimensions.

Nightmare: Indeed.

But when it comes to controlling the mind, they are simply the best there is. Dark Mind can dominate people without a second thought, and Nightmare is a master manipulator.

((BTW, let me explain something. I made Nightmare the embodiment of subconscious fear, like paranoia, which can convince people to do things. Thus, Nightmare is a master of manipulation. Dark Mind is the embodiment of direct fear, like screamers or something. Direct fear can take over your body and make you do weird things... Thus, DM can dominate people easily.*