Step 1: Develop an Unsettling Presence, a.k.a. "The Glare of the Damned"
Step 2: Cast Shadows with Confidence, or learn to love the darkness
Step 3: Master the Art of Menacing Gaze, a piercing stare that freezes blood in veins
Or, you know, just be yourself, and you're probably already a master of ominous influence.