Rites of Spring is the third supplement of the excellent Changeling: the Lost series, and doesn’t disappoint when it comes to doing what supplements were supposed to do: expand the game in both mechanical and conceptual scope.
Rites of Spring concerns itself with the magic of the Fae, and how that magic works for them. As beings fundamentally twisted from the human template to become something else, the Changelings are suffused in magic. It is a magic that defines them, their dealings with each other and the world around them. While the corebook gives a good idea of how they work, Rites of Spring opens the floodgates when it comes to the myriad possibilities of their nature.