My dark friend

I was born on a bloody hospital bed.
An unnamed woman gave birth to me.
She vanished that early morning.
Hazy days accrued later, events became colorless.
A fire started in the basement of the hospital, everyone's dying, the pain was the only screamer and the smell of burning flesh.
My master rescued me, made my path, and concealed the evidence of my birth.
I will roam the land free, I will butcher, I will conquer, I will spread chaos.
I have to fulfill his wish.
I'm his new owned demon.