This is a mandatory game feature that you have to tackle. This is where you have to light up memory crystals by completing a set of tasks assigned to each crystal. Completing these tasks and restoring your memory is necessary to advance through the story and further strengthen your character. The task completion is considered retroactively so it is possible to just breeze through several tasks if you have met the requirements before accepting them. Once all memory crystals have been activated, you can now awaken the full memory and obtain the rewards.
I'm stuck on last memory day says need to kill lvl 72 or Lvl 78 prison demon boss only problem is there is none. I'm rb.1 lvl 60 so any advice on what to do or anyone else stuck?