This is a great concept for a story, but there are grammar/spelling issues everywhere, the storyline seems sort of clunky and awkward, and some parts need much more detail than you are giving them.

So griffons deciding to eat ponies. Seriously? And "green rock" that affects pony magic? Real original idea there. Honestly this story already sucks.

Watching this story soak up the dislikes shows your incompetence as a writer and brings a smile to my face.