Nightmare: A creature from ancient times that lives by devouring human nightmares. When it encounters a threat, it will release a variety of terrifying dreams to scare away the enemy.
Nightmare: refers to being suddenly awakened by a nightmare during sleep, and then being able to clearly recall the horrific content in the dream and having lingering fears.
Nightmare: In Western mythology, after the unicorn falls, it will change from pure white to black. It can control lightning and travel through dreams.