(3 pt Merit)
When you speak, everything is the truth. Your words never quaver, your vital signs remain normal, your facts seem consistent and your eyes betray no deception whatsoever. No matter how outrageous your story might be, an objective observer will assume that at least you believe it's true.
In game terms, most casual deceptions succeed automatically. Subtract two from the difficulty of any roll that involves fooling someone about something important. This Merit will not foil Mind magic, aura-reading or other forms of mystic truth-seeking, but it will deceive any mundane detection (like body language or lie-detectors).