The strongest powers inside and outside the Universe are Gods and the Spirit guides known as Dreams and Nightmares. Unlike Beings, spirits are absolute in their predisposition. In their nature, spirits try to balance the powers that affect the Equilibrium. In their powers, Nightmares affect beings in a primal way. Within a trance-like state of sleep in a Being, Nightmares induce subconscious patterns and shape the mind towards destruction. How little these images are to the Being, they can portray the future however the Being may understand it.
As Spirit Guides of War, Nightmares induce destructive rage amongst many Beings.