|The Branches of Modesty, lost forever, alas.|
This fruit is not actually an apple, nor fig, pomegranate, citron or any other known fruit. It is a green sphere with golden streaks about the size of a large grapefruit, perfectly preserved since time immemorial. The two bites in it, one on each side, reveal a pearlescent white flesh that shimmers with the promise of the knowledge of good and evil.
Any who take a blasphemous third bite of the apple will surpass their ancestral parents' moral insight. Beyond knowledge of their own good and evil nature, they now are granted the ability to see good and evil in others. They can concentrate to get an idea of the good or evil motives of another person within 10' of them.
Of course, for such a campaign-breaking power there must be a disadvantage, right? Some possibilities ...
1. Roll the character's Wisdom each time. If failed, the character sees only potential for good and evil, not actual good or evil motives, without knowing it. This can lead to false accusations or unfounded trust.
2. Each time the power is used, a stalking angel with a flaming sword gets 500 feet closer to the character. When the angel makes contact, he banishes the character from this world, into a world of even lower promise.
3. The power also heightens the character's sense of his or her own sinfulness. Each blameworthy act he or she commits will force a save vs. spell (Will) or be driven to suicide.
4. After a certain number of uses, the character becomes "beyond good and evil" - losing the supernatural sensitivity and indeed all sensitivity to moral distinctions, amoral and possibly sociopathic. (All right, this is not recommended for players who would actually revel in this development, and by that I mean almost all of them.)
5. Save or die each time the power is used.