Ahh...I know what this is. I don't have it either, I think it's the secret ending. I don't want to give spoilers, but apparently it's so secretive that from what i HEARD [I could be wrong] you can't even die once apparently. It's the 'you changed' [spoilers]
but I could be wrong, from what I heard you have to get this first and you have to have never died prior.