There’s nothing Rainbow Dash can’t outfly. Except her own ego. Find out how far she’s willing to go in order to break all of her speed records and plunge straight through the heart of her own sonic rainboom!

It’s an open question as to whether heroism and sacrifice will triumph over foolishness, fatal error, and pony frailty in Rainbow’s dangerous and ill-fated experiment.

UPDATE: Included in 'Twilight's Library', how cool!

UPDATE TO THE UPDATE: 'Rainboom' has just been added to the elite 'Royal Guard' group of stories, huzzah!