Your mental armor (MA) is a measurement of how well protected you are against mental attacks, much as your armor value is a measurement of how well protected you are from physical attacks. The higher your score, the less likely an opponent's mental attack will have a severe effect on you. Your MA is modified by your Willpower modifier. The effective default value for MA is 4. MA is a hidden stat, and if displayed in a debug window it will typically be 0. This score is then increased by 4 for calculations involving MA.