She was surrounded by dead Slayers. Giles lay dead at her feet, and behind her, she heard Angel howl as a stake pierced through his chest, turning him to dust.

She looked up into the sky.

Willow hung in mid-air, dressed in black, her face all pale and veiny, her eyes shimmering with the darkest sort of magic. In front of her, in an aura of bright green, fluttered Dawn, Buffy's sister. Literally, Buffy's own flesh and blood.

Willow was killing Dawn.

And ending the universe.

And Buffy was powerless to stop her.