The following is Open Game Content from a 3PP Source
Terrifying: This armor is so terrible in appearance that those who see it are filled with fear and dread. Three times per day, the wearer of a suit of armor with this ability can cause the suit to radiate a type of fear. Everyone within 15 feet of the wearer must make a DC 16 Will save or become frightened for the next 7 rounds. Frightened creatures that are cornered will fight in order to escape. Creatures that succeed on the Will save are still shaken, with this condition lasting 1d3 rounds.
Faint necromancy; CL 7th; Craft Magic Arms and Armor; fear; Price +3 bonus.