Faerie Mysteries is part of Legendary Games' Adventure Path Plug-Ins series, which offer a set of nice options for dungeon masters to add to their game as they see fit. Looking for a magical feature to give a dungeon some flavor? An encounter to soften up a party before a big fight? Did half of your players cancel and you need a quick side quest? This book can solve all of those problems for you.
As expected, Faerie Mysteries focuses on encounters with fae. The book includes a few monsters toward the end of the fae type or of other types that are thematically related to fae, but more importantly, it includes encounters that are not necessarily just monster battles. Much of the book focuses on locations of close proximity between the material plane and the fae realm--where faerie magic spills into the material world. There are various types of encounters called fey influences--which include several encounter levels called rumors, ripples, and ruptures. These are all low to mid-level encounters that aren't terribly dangerous, but do add something interesting to an adventure. Rumors include things like areas with active illusion spells triggered by players that are little more than distractions that they will want to investigate, but turn out to be harmless. Ripples are more severe releases of fae energy that often threaten the players with some sort of minor magical penalty for a short time. Ruptures often present a threat to the players, and might harm them with physical damage or a magical curse.
As well, there is a list of more traditional encounters that can be added into nearly any adventure. Whether walking through a forest, crossing a river, or even in town, there are ways to seamlessly get your party involved in an extra encounter. The only downside is that most adventures top out around level 8. Then again, there are many encounters of variable level that can serve as adevnture hooks that can easily lead to far more powerful encounters with a little prep. Some of the included hooks even could spark an entire fae-themed story arc if you're just looking for a place to get ideas.
Though it doesn't offer anything for players, this is a great book for dungeon masters. It's perfect for those who find that they need to improvise and add an unexpected encounter on occasion. It's a great book to have around for when you're in a pinch and need to keep your players occupied.
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