Ever since Fluttershy and the other Elements of Harmony reformed him, Discord has spent all of his time at the castle and ensuring that Celestia and Luna get properly entertained. However, after some time, Celestia has enough and is almost ready to banish him and turn him into stone again when the Princess of the Night has a brilliant idea...
An awful idea...
A brilliantly awful idea...
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Cover art from Jamescorck