At Discord's urging, Princess Twilight hops on through the mirror portal to Canterlot High, which had been closed for two millenia. Instead of a school, she finds herself in a cargo bay of a starship. Discord also has popcorn at the ready.
Set in Next of Kin to Chaos (Discord is Q). Twilight is an alicorn. Fluttershy isn't. Discord promised Celestia not to do anything to alter this status. Discord doesn't always keep his promises.
War is coming to Equestria, a war on multiple fronts unlike any known in their history. Aided by new allies from the PHL and the remnants of humanity in Britain, the ponies of Equestria must prepare for the convergenceā¦
Twilight's convinced Discord hasn't really reformed, and has found a weapon to replace the Elements -- a reforming spell Discord missed eating. But a cornered draconequus is a dangerous beast...
Somepony seems to have thought it would help Discord with staying on the straight and narrow if he were required to send Celestia reports on friendship, like Twilight Sparkle does. Somepony was plainly out of their mind.
After reforming, Discord has been living with Fluttershy. He's established genuine friendships with some of the Mane 6 and has been working on re-connecting with Celestia... until the day he's arrested by the Q Continuum.