Nightmarish is a monster trait that is unique to Diablo III and was first introduced in Beta Patch 14.
Nightmarish monsters have a chance to fear the player on hit and can be triggered from both melee and ranged attacks. The "Feared" debuff lasts for 3 seconds during which the player runs uncontrollably away from the monster. A skull icon appears above the player's head indicating the applied debuff.
This trait can occur for any monster.[1]
Monsters can also be affected by the nightmarish ability if they take friendly fire, such as is the case with an exploding Grotesque.
References
Diablo III Monster Traits | ||
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Diablo III | Arcane Enchanted • Avenger • Desecrator • Electrified • Extra Health • Fast • Fire Chains • Frozen • Health Link • Horde • Illusionist • Invulnerable Minions • Jailer • Knockback • Missile Dampening • Molten • Mortar • Nightmarish • Plagued • Shielding • Teleporter • Vampiric • Vortex • Waller |