Buffy The Vampire Slayer, season 8, book 29: Retreat, part 4
Jane Espenson, Georges Jeanty et Joss Whedon2009

Oz’s temple in the Tibetan mountains is no longer a safe retreat for Buffy and her troops. Discovered by Twilight’s magical agent, Amy, and bereft of their own magic, the army is preparing for a human war with guns, grenades, missiles... and MANPADS -- it’s not a laughing matter. People are about to die.

But even without her own magic, Buffy is still a Slayer -- the Slayer -- and she has to lead the way to victory. Or at least... live to fight another day.