It's a really interesting idea, and I can't wait to see it take off. :)
The way you introduced it in the prologue was pretty cool. It does need a little more background, but other than that I totally got what you were saying. And I like how you made up your own words to fit the story, I think that's really creative. Overall, it's really good and I can't wait to see how it progresses. :)
First off, I'm not a big fan of the picture of Gerard of the side, but whatever. You can still read easily enough so it's all good.
Your writing is very nice, it flows very well. I didn't see many grammar mistakes, so that's good. Your vocabulary was great, also.
There was a moment where you wrote in italics but I think it wasn't in the past anymore so maybe you should change that? I'm not sure if it was supposed to be like that or not.
It would definitely suck to be the Death God. Ugh. It's very original though, and I'm glad that there's a a kind of supernatural story about Gerard where he isn't a vampire.
The way you introduced it in the prologue was pretty cool. It does need a little more background, but other than that I totally got what you were saying. And I like how you made up your own words to fit the story, I think that's really creative. Overall, it's really good and I can't wait to see how it progresses. :)