Cordelia sends Madison to Murder House to get dirt on Michael.
Flash-forward to Apocalypse, when Michael is now an adult with superpowers. He's attracted the interest of our Coven witches, and the committee at the warlock school he attends wants to test him for Supreme, the title given to the strongest possessor of magic. In Coven, that title was given to Cordelia Goode (Sarah Paulson), who reappears in Apocalypse, and who's aware of Michael's strength. At first, she refuses to let him perform the Seven Wonders -- a series of tests that, if completed properly, confirm the next Supreme. But after experiencing a vision of impending doom, with Michael its white-faced perpetrator, she agrees to test him and let him win, so that she can keep a close eye on the man who will destroy the world.
This plan is kept secret, of course. First, she has Michael descend into Hell and resurrect her last original witch, Misty Day (Lily Rabe). (Jamie Brewer's Nan was also in the original, but her soul was handed over to voodoo king Papa Legba, so she's probably irretrievable.) With Misty's life restored, Cordelia has tremendous power on her side. But it's not quite enough. She needs to know more about Michael so that she and her coven might vanquish him.
So, as "White Witch" Stevie Nicks serenades a distraught Misty, Cordelia telepathically summons fellow witch Madison Montgomery (Emma Roberts) to another room. She tells her that she needs her to go on a mission for her, to the house where "it all began."