To fully prepare yourself for Endwalker, the director of the game Naoki Yoshida advised you to do specific tasks that’ll give the players the best experience. Bahamut, Alexander, and Omega activities will prepare you for the arrival of Endwalker. Bahamut was introduced in A Realm Reborn. Alexander was announced in a 2014 fan fest, and Omega is the final raid you need to complete before Endwalker.