Surprise 3,864th Birthday Party: Fantasy

They were having a surprise 3,864th birthday party for her. It was supposed to be a secret, but one of the servants had let it slip while she'd been torturing him, and she was so surprised and pleased that she'd actually let him live. Crippled, yes, but alive. Why, nobody had tried a surprise birthday party for her in--six hundred years? Had it been that long? And now her distant descendants, or rather the more recent descendants of this body, had decided to surprise her. She was amazed. It was still well-documented how the last "surprise" birthday party had turned out--she thought the mummified bodies of the attackers were still in storage somewhere. So they *knew* that any attempt to kill her must inevitably fail. The body would die, yes, but the essence of her would simply pass on to the next in--

Inspiration: Phil's grandmother's surprise 80th birthday party. However, she is not an evil bodysnatcher. I think.
Story Potential: High, surprisingly enough. ::groan::
Notes: No, really, I'm a bit intrigued by this.