Okay, basic made-eyed rules.
Made-eyed(trait):
You are descended from humanoids altered by the Makers.
You gain a +4 bonus on spellcraft, use magic device, and knowledge checks related to the Makers and their creations, and can detect hidden planar portals with a successful spot check (DC varies).
You also take a -4 penalty on saves against any magical, supernatural, or spell like abilities of creatures and items created by the Makers, and most NPCs start out with a relationship of acquaintance(negative), due to superstitions about made-eyed.
Some prestige classes and monster classes represent additional made-eyed abilities, and require this trait as a prerequisite.