You are able to lie extremely well about a chosen field of knowledge, using your extensive knowledge in place of your ability to bluff.
Benefit: When you take this feat, choose any one Knowledge skill which you have improved with the Skill Focus feat. Whenever you wish to lie about a topic which is encompassed by this Knowledge skill, you may use the Knowledge skill in place of the Bluff skill to oppose your opponent’s Sense Motive skill check. All normal modifiers for the lie’s believability apply to this check.
Undefeatable: The Collected Feats Sourcebook, Copyright 2009 – 2010, Louis Porter Jr. Design, Inc. Undefeated, Copyright 2011, Louis Porter Jr. Design, Inc.