First things first, this will be a Raid Event on Mount Oe, like Ibaraki’s event. Unlike Ibaraki’s challenge, Masters only need to have finished Fuyuki, so you should be GOLDEN.

There’s gonna be four different raid bosses this time, and only the final one is a berserker! To reach the next raid you need to progress through the currently available main quests, which shouldn’t be too hard.