Gimbles Guide to the Feywild

From the introduction:

The Feywild is a place of magic, illusion and high emotion. A place of the brightest sun and the darkest night; of wonder, fear and occasionally ridiculousness, where a terrifying forest may turn out to be harmless and an encounter with an innocuous seeming old woman could lead to an untimely death. For those who find themselves within the boundaries of this strange place, the line between illusion and reality becomes consistently more blurred until it becomes impossible to know whether the things you are seeing and the emotions you are feeling are real or illusion.