Once Upon the Time is inspirational with some useful ideas, unfortunately it is hampered by a poor conversion to the Pathfinder rule set. I hope that a second edition with a cleaned up and improved set of rules for Pathfinder will be released soon.
Once Upon A Time: A Guide to Fairy Tales for Pathfinder is a 46-page PDF (36 pages if you remove the cover, OGL and ads) written by David Caffee and published by Avalon Games.
