In a alternate world Twilight is a Thestral who often has to fight her own predatory instinct. Trixie is not so good with magic, but is vary fond of her friends. Derpy try's hard to help her friends and hates conflict. And Diamond Tiara has to say good bye to her old life when going to the orphanage after her parents death. The four of them live together in the same orphanage. But when the bullying and the fact no one cares about them have the four run away. What will happen?
Warning spoilers Gore tag because blood will be mention in future chapters

Update 6/9/17
Finally got a cover image on this. but there were no filly Thestral Twilight ones. Oh well.