Imagine possessing the power to control the emotion of fear itself. You would know what your target fears more than anything else and then manifest and amplify it in order to horrify your target. Sometimes this would cause your target to go mad with fear or experience so much terror that they would literally die of fright. On other occasions, the user of this power can be empowered by fear in order to augment their physical capabilities. I am thinking of giving this power to one of the main supervillains in the final volume of my main series. The reason for this is because fear is the one thing that spreads faster than any biological virus.