Read the title
You're gonna need to clear the High Midgardsormr trial, You unlock this by defeating the Master version of Midgardsormr.A requirement is going to be the Midgardsormr print which will reduce damage taken.
I believe only one group has actually taken it down so far.
May I add about the "only one group part".
Don't do this with randoms, You WILL need a strategized team for this and randoms will not have this strategized(it might but the chances are low) you gotta have a team with people you KNOW has 1 of the units needed, 3 fire type attackers(best if Mikoto or Ezelith) and a healer ( best choice is Verica)
So if I dont know anyone who plays this game and have suboptimal adventurers it's basically impossible
