Wow! This is a pretty griping prologue...it has a lot of drama in very little text.
It's really intriguing, and after reading this I really want to read the next chapter and figure out what is happening.
In this tiny prologue, you have incorporated a lot of graphic detail about the pretty disastrous day. I can just see the giant once-mighty castle crumbling to ashes. I love the line where you say:
The tall, beautiful castle of Marlon was nothing but ashes now.
This line really sparked my curiosity:
No one could survive the natural disasters taking place across the country, not even those born of magic.
Because of the "not even those born of magic" part, I understand there are people born of magic in this now-dying place...That gets my little nerd heart beating sooo fast.
I also really like how you end the story. The last line is a nice touch.
On the whole, it's a pretty good prologue, albeit a little short, but it makes for the shortness with dramatic effect. Can't wait to see what happens next.
Keep writing. <3