Figment

A figment is a strange creature. Figment's are not even proven to be real, but they create illusions. They have the power to get inside your head and do what they want with it. Mind control, fear, trigger emotions or memories, make you see or hear or smell things.

Information
Some call them phantoms, but they are not dead. Some say they are simply illusions, created from heat or exhaustion, but that's not the case, as they have physical energy. It is unclear what they look like, as there is no proven sight. Anyone who comes face to face with one of these creatures is instantly driven to madness. The only thing those people, the Psystruck, say after coming face to face is 'pitch'

How to kill
No-one ever has

AND NO-ONE EVER WILL