The material below is Open Game Content from a 3PP Source
Nightmare Weaver (Combat)
You can use your ability to create magical darkness to terrorize enemies.
Prerequisites: Improved Unarmed Strike, Nightmare Fist, Intimidate 2 ranks, ability to cast darkness.
Benefit: By spending a full-round action to cast darkness, you can also make Intimidate checks to demoralize all foes in the spell's initial area.
Special: This feat counts as Dazzling Display for purposes of qualifying for Deadly Stroke and Shatter Defenses.