"Okay." Dawn nodded, smiling a bit before it faded. "So, there were these monks, right? And they were very...monk-like, but they had a purpose. To keep something called the Key from this super hellbitch Glory. So, they gave Buffy a sister, because of her whole calling thing, and made it like she'd always been there. Except she hadn't. Because she was the Key."
For some reason, there was a part of Dawn that didn't want to say it straightforwardly, and she hoped Murphy caught onto what she was saying.