Prologue's a bit short, but i'm loving the detail you put in there. Really lets me imagine the scene you're portraying.
In a dark cathedral, high upon a hilltop, a woman's cries were lost in the torrent of rain and thunder. I like this line, but Cathedral is a little odd. Small Church maybe?
The midwives and the doctors did all they could to help, but the woman knew her time was coming. With a final push she delivered the child into the world, and with her dying breath whispered Expand on this, describe the inside of the Cathedral, the woman giving birth, the doctors and midwives, the lighting in the room even. Paint me a word picture
"Go forth, my son, Gariah..." This line is lame, its not something id expect a mother to say either.
And with a final flash of lightning, the woman was no more. I like this line, but you should describe her final breaths in more detail.
Still, I really want to read more
Sorry if i come across as a prick.