After experiencing a humiliating defeat at the hands of Anne Boonchuy, a fragment of the Core enters through a portal that leads to Equestria. After discovering that the land is filled with the Magic of Friendship and has a new ruler, the Core plots to undermine it with a plan that neither Twilight nor her friends will be aware of.

Note: This happens after the events of Amphibia’s series finale “The Hardest Thing” and during the events of MLP: FIM’s “The Last Problem”.