Something that takes place after Skylanders: SuperChargers and before Skylanders: Imaginators.
During their rehabilitation, Master Eon gave the Doom Raiders a choice - either go back to the newly rebuilt Cloudcracker Prison, or to become Skylanders Sensei, teaching a new generation of Imaginators their formative battle skills as well as how to stay out of the life of crime, they all accepted the deal, but first have to prove themselves by rearranging all the books at the Academy's library, a task that took almost two years, testing every ounce what they had!