Aie Luna 201

"The Restricted library is where I have kept all the worst magicks in all of equestria, forbidden magic, dark spells used by all the worse of Equestria's enemies."

"And Discord of all peple got into the library?" You ask tilting your head

"It was different back then," she looked down slightly "When he got in to the library he read everything, he grew a fondness for manipulation spells, reality warping spells, shapeshifting spells; the last having been a spell that served to warp his mind beyond repair...Leaving him twisted and broken."

Luna picked up  "after fully corrupting himself he dissapeared for nearly 200 years. before soon appearing to temporarily take over before we sealed him in a prison of stone, however you all know this already"

"As you also know he had a cult. Dedicate to following him. " Celestia carries on "Amongst the group is often a leader chosen to serve as a vessel to Discords magical energies."

"So he has a spell that allowed him to possess others?"  Trixie asked