Slither

Oh, my dear, why are you here? were you left or were you right, are you exhausted from all of the fighting last night? Don't be afraid, I say, as I run my smooth fingers across your dismay. I don't say this because there will be a way, for you to survive this, not on this day, but I choose to spare you the hope that just may, poison your last moments in this dream that you pray, I want to enjoy the thoughts you can't say.  

There is no point in fearing, just because you sleep. Your nightmares protect you from the truth I am masquerading. 

I drugged you my sweet. I drugged you indeed. Now I sit in this chair across from your need, and I watch as you bleed, each and every drop sending me into sweet, sweet blissful agony. You can't survive me. You want to know why?

I am your destiny, to help you die. 

(This was left intentionally vague, as the killer can be anything or anyone. The idea is that she fell asleep and is dying. Whether it is in her mind or in reality doesn't matter, but she will die, and this is the voice she hears in her final dream. The idea here is for you to imprint your fears onto the voice.)