It's this one. How do you fight the golem? Can't seem to click on it or anything and have fought all in Willows menu (only one I couldn't fight was isabella, greyed out directly).
Talk to Willow again. There's a DUELS/MONSTERS tab at the top in that window where you choose your opponent. And that's Mia, not Magda. You need to be dating her during the wargame event to unlock it. Talk to her before third battle.
