There were many new things to learn, because the battles in Reshanta were different to those in Atreia. That is why you visited the instructors and learned from them how to conquer a fortress, and how to use Aetheric Fields, Fortress Gates, Guardian Generals, Artefacts and Kisks. You also discovered that the Balaur battleship Dredgion is making the Abyss unstable. After training, you visited Claudia and received a Kisk from her that will help you during your travels through Reshanta.