Beacon of Terror is a darker, more offensive, version of
Beacon of Adoration. It is a refinement of the fear component of that ability, allowing the psion to project an aura of fear, domination and reverence. Instead of affecting people to awe and be inspired by you and listen to you, this ability makes them fear you.
It operates on the same mechanics as
Beacon of Adoration, affecting those who fail their mental save against the PSI-points spent on the ability. These people will have an unreasonable and unidentifiable respect and fear for you, simply by being in your presence. They are at a -6 modifier to defend against any persuasion or intimidation attempts from you, and most will simply agree to what you are saying out of fear.