It's the Olden Pony! She is a scary old mare from a scary ghost tale. Her frightful demeanor makes ponies go pale! This old nag seeks for her missing horseshoe, and will corner any lost pony she finds in the dark woods. What she does to them is a mystery, but unless she gets her horseshoe back, nopony is safe from her spectral wrath.
I've been wanting to make a vector of her for a very long time, however, references proved to be difficult since she appeared only in one episode, and in dreams, which have a fainting ripple effect. Fortunately, I found a really good template on the back of the season 3 DVD. There were some difficulties here and there, but it was a success. I plan on using her as a template for an OC character at one point.
Traced from My Little Pony: Friendship is Magic Season 3 Episode 6, "Sleepless in Ponyville."
My Little Pony: Friendship is Magic created by Lauren Faust and owned by Hasbro