Based on the comic by Anonymous http://cheezburger.com/7056692224
Princess Twilight received a letter from a young filly called Star Shine in a hospital, She visits her and makes a vow to find a cure for her disorder.
After hours of searching, Twilight finally finds a cure; but at a very high price…

Will Twilight keep her vow, or crumble down by the weight of the pressure?