Nightmare

The Nightmare is a hostile creature added by Witchery. This creature is found in the Spirit World, but only when the player is experiencing a nightmare. The Nightmare monster is a physical representation of the nightmare that the player experiences in their sleep. It will haunt and attack them, dealing to  points of damage. Nightmares have health points and will respawn shortly after being slain. They will always respawn near the player, so attempting to kill it without the desire for its drops is useless. Having a Charm of Fanciful Thinking in the only form of protection from the Nightmare, as dreams strip players of their armor and items. When slain, it can drop Mellifluous Hunger.