The following is Open Game Content from a 3PP Source
Aura moderate necromancy; CL 7th
Slot armor; Price 50,750 gp; Weight 55 lbs.
Nightmare armor is a suit of particularly horrific +2 blackguard armor. The armor is black as night with leering demon faces worked into the breastplate, shoulder guards and thigh protectors. Three times per day, the wearer of a suit of nightmare armor can radiate a powerful type of fear. Everyone within 20 feet of the wearer must make a DC 18 Will save or become panicked, fleeing from the wearer for 7 rounds. Panicked creatures that are cornered and unable to flee begin cowering. Those creatures that succeed on their saving throw are still shaken for 7 rounds.
Requirements Craft Magic Arms and Armor, fear; Cost 24,250 gp