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The Transformations Trilogy by Kris Walberg (NC-17)
In this beautifully written, post-Ascension fic, Buffy, Giles and the gang go through quite a bit. There's a new badass vamp in town and Giles' past is revealed to be rather darker than initially assesed. Hold on to your hats and buckle yourself in. This is gonna' be one heck of a ride! (unfinished)