Feat: Devil's Advocate
Access Chelaxian nationality
You know more about the habits of devils than is entirely safe. You gain a +2 circumstance bonus to Perception checks against devils and saving throws against their abilities.
In addition, whenever you meet a devil in a social situation, you can immediately attempt a Diplomacy check to Make an Impression on that creature rather than needing to converse for 1 minute. You take a -5 penalty to the check. If you fail, you can engage in 1 minute of conversation and attempt a new check at the end of that time rather than accepting the failure or critical failure result.
Special If you have the Glad Hand skill feat, you don't take the penalty to your immediate Diplomacy check if the target is a devil.