Who are you?

It was the day i meet you
I saw you standing as the wind blew
a small dark person standing there
all you did was stand and stare
i was walking blindly, then i could see
i saw someone walking towards me
I said "who are you?"
You replied "i am your wrost nightmare boo!"
i was scared, i stood frozen in my path
you said " subtract the odds, add the evens, do the math"
i was confused, i was frozen as ice
i fell to the ground frozen with fright
then you tossed me two small dice
it was the darkest night
i layed there on the cold hard floor
i was so achy from the bruised sore
I threw you the dice as hard as i could
they layed there on a surface of wood
I said shaking, "what do you want with me?"
you walked to me and bent down on one knee
and said to me "I want you to be mine
i layed still and watched the time
It flew right out the window in no time flat
i saw you turn into a bat
it was somehting different and new
as you flew away i yelled, "Who are you?"