The Rookie's Guide to Killing a Slayer
Disclaimer: The Buffy the Vampire Slayer characters and world are not mine. Original characters and plot elements mentioned here are (and are taken from my incomplete "Lady Liberty" epic). Readers of "Lady Liberty" warned: spoilers for future tales and character death (or deaths). Non-readers: Don't worry, this story can also be understood as a standalone.
"Killing a Slayer is a difficult, some say impossible, goal." Darla pointed out, quite looking down her nose at her youngest companion, variously known as William the Bloody or as Spike. Her three other companions all agreed, Angelus and Abigail trading a guarded glance while Drusilla, in an oddly lucid moment, nodded at Spike.
Darla, being the eldest of the group, knew just how difficult a goal that could be; she had more than once set her sights on a Slayer, and had not yet achieved what some considered the ultimate accomplishment for a vampire. It was bordering on ludicrous for Spike to declare his intent to do so, after a mere two decades of vampiric existence, and would have been considered even more so before Angelus had (debatably) managed after only four decades.
"What would you know about it? You yourself have admitted you've never done it, nor have you seen it done." Spike challenged Darla.
Drusilla was oddly quiet - she tended to react mostly to Spike, but it was Abigail who reacted this time. "Spike, do not speak further of this. A Slayer is... a force of nature. This circle has chosen to avoid Slayers since I have joined it, mostly at my insistence. It is not a healthy thing, for a vampire to attract the attention of a Slayer."
"And what would you know of it? Have you killed a Slayer, Abigail?" The hesitation before she replied was enough for Spike. "I didn't think so. Then don't try to talk me out of this."
Abigail traded another meaningful glance with Angelus, and he turned on Spike. "Spike, you don't know what you're talking about. Abigail and I... well, it's complicated, but one of us did take down a Slayer. It's not a trivial thing."
"One of you?"
Abigail clarified, "We were both there. Under the circumstances, it's difficult to determine who was actually responsible. I like to let Angelus claim the kill, though he sometimes insists it was me."
"A gentleman does not claim the kill of another." Angelus protested.
"I was drunk." Abigail countered. "Very drunk."
Spike turned and looked at Angelus. "So how did you take out this Slayer?"
"Well... a lot of it was luck." Angelus paused. "I don't think you'd be able to do it the same way, not unless this rebellion goes on a lot longer and..."
"Angelus..." Abigail hissed.
"Well, to make a very long story very short... the Slayer let her guard down. I happened to be there, and was able to take advantage of a moment of weakness. She was, in fact, extremely drunk."
Abigail nodded. "And that was my doing, which is why Angelus claims that..."
"I did not kill her. Not on my own, not under honorable conditions, really."
"Let me get this right. You were drunk, the Slayer was drunk, and Angelus was being a perfect gentleman and just happened to kill her?" Spike shook his head. "That's not how it happened."
Darla circled about the cave, running her fingers through Drusilla's hair, then Spike's. "Perhaps Angelus was being a bit naughty, but... the Slayer did die that night, the night the world turned upside down."
"Define naughty." Spike smirked. "What did he do, sleep with her first?"
Abigail blushed, and Angelus looked down. Darla filled in the gaps. "He did, from what he told me after. Remember, she was very drunk, and for a Slayer, that takes quite a lot of drink, I'm told." She looked a Abigail, who was beginning to get a reputation as an expert on Slayers - and that was the real reason the group had come to China, so that they could build their standing in the vampire world by sharing Abigail's Slayer knowledge.
"It does. Slayers... well, they are a lot like vampires in certain ways. The resistance to alcohol and other poisons is not as strong as it is with vampires, but it is there."
"And you know this how? If you so carefully have avoided Slayers?"
"Only since she joined us." Angelus pointed out. "Which was just about when she and I killed the one."
"Not an experience I'd care to repeat." Abigail admitted. "Particularly if it requires getting as drunk as I was that time. I had quite the hangover the next day, one I'm not sure I ever completely recovered from."