When mortals close their eyes there are two worlds that you open yourself into, the crystal realms and the shadow realms. The crystal realms being where your good dreams come from and the shadow realms where the nightmares come from. But they were not the only ones coming out at night, there were also the moon seekers and other types of demons who hunt on mortals. They come because of orders from the dark lord , a power hungry creature who had taken over the two realms. But you must not forget , there is always light even in the darkest of times.