As the three thousand year anniversary appears for the victory of one of Equestria's greatest battles, all is well until a past allie comes back for vengeance. Princess Storm, the only pony powerful enough to control the weather as her Sisters control the Sun and the Moon, was once thought to be defeated in battle and her death mourned. Known for her peace, tranquility, and love for all, she was highly revered as a hero - but was forgotten as time passed on. On the day of the celebration, she returns, with nothing short of pure hatred for those who didn't try hard enough to remember or save her.