Thread:Pokemonmastercb/@comment-24908786-20180824002048/@comment-24908786-20180830130301

True, but she used her knowledge regarding Lord Tirek from her studies to cast the spell that essentially acted as a long-term version of Tirek's ability to suck the magic out of a pony over a period of 72 hours, first taking away both unicorns and alicorns' ability to use magic with their horns and cast spells, then taking away the innate magic that allowed the alicorns and pegasus ponies to fly, along with stuff like what allows Celestia and Luna's manes and tails to sparkle and flow of their own accord, and finally taking away the magic in magical artifacts, such as Neighsay's medallion he uses to fast travel from one place to another via his portals.

Once the drain was complete, she could have delivered the magic right to Tirek, restoring him to full power, and he easily could have busted out of Tartarus then to take over Equestria.