Needs review
Source: Rokugan Campaign Setting

Description: Through self-control and discipline, you are able to cloak your true motivations, even to the eyes of magic..

Prerequisites: INT 13

You may emulate any alignment up to one step removed from your own, plus one additional step each time you learn the feat again. You may not take this feat more than twice. (For example, a Lawful Evil character with two levels of Perceived Alignment may pretend to be Neutral Evil, Lawful Neutral, Chaotic Evil, True Neutral, or even Lawful Good.) This feat's benefits are negated if you act in a manner that publicly disproves your false alignment, unless somehow you rebuild your reputation.

Limitation:

Artifacts, as well as effects or tiems with a caster level five or more levels higher than your own, are not affected by this feat. They're simply too powerful to be fooled.