Luxerk, a Nobody used as a last resort by the Organization XIII; a backup 13th Seeker of Darkness. When a group of Keyblade wielders attack the Castle that Never Was, he escapes to another world, unknown to both Nobodies and Heartless alike.
An unknown disease sweeps through Canterlot City, attacking its youth, and a villain of the past seeks to progess it. It will take Unicorn and the expertise of a Legendary Rider to end this epidemic.
Crossover/continuation with Chrono Trigger & Chrono Cross: Rarity is sent on a journey through dimensions in the hopes of finding the way back to her own.