If all Twilight had to do to become a princess was complete one of Starswirl's spells, then why couldn't Starlight do the same? That's exactly what Starlight intends to find out.
As a result of a magical mishap in the name of protecting Equestria, the princesses fuse into a single being. But in order to bring them back, she will have to stop existing. What does it mean to die?
Pinkie Pie and Rainbow Dash spend a day in a meadow, and some silly shenanigans lead into a storm. What happens shortly after makes Dash question her feelings toward her best friend.