Your alignment is known to you and you alone. Those who try to learn your true alignment find it hidden or receive a false result.
Prerequisites
Fiendish Pact, any one other Fiendish feat.
Benefit
Upon gaining this feat, choose an alignment. Spells or special abilities that would normally reveal your alignment return as being this false alignment. You can use either your true alignment or the false one when using magic items with alignment prerequisites.
You immediately know when someone is attempting to use a spell or ability to learn your alignment. You you can spend a use of your Fiendish Pact to learn the name and alignment of the creature using the effect and you gain a profane bonus equal to the number of Fiendish feats you possess on Deception checks you make against that creature for 1 hour.