It's starting to really annoy me, lol. I have the voice in my head of who says it. But can't put a face to the sound, nor a movie or book, or wherever I have heard it.
Damn you brain for failing me. Damn you!
EDIT: I'VE GOT IT!!!!!!! I KNOW WHY IT IS SO DAMN FAMILIAR!!!!
*Ahem* Sorry 'bout that. I was excited
I'm not sure if its where you both heard it from but why it's so familiar to me is because Visas says it to Darth Nihilus in the Introduction of their characters.
When she is on the bridge and she goes to ask if he thinks the Exile is a threat, he then force chokes her and she says something along the lines of: "You ... are the darkness in which all life dies, milord."
I knew it was a female's voice. It was like on the very edge of my hearing but I just couldn't grab it!