I finished the Class Quest “Trails of Fortitude” but it took me about 45+ minutes because, after defeating the other two, Vivica just kept regenerating and my half dead team, even with attackers, just couldn’t do enough damage to her vs what she was able to heal. It was a very long fight, sometimes she would be up 2000, then I could slowly work her back down to 500 or so, but with her being in the center, any time I got a remotely bad board and had to fire dead tiles into her, she healed back up again and again and again. But there is no way she could have killed the team I had, which also had Vivica. I even had a debuffer to clear her defense buff, but it still wasn’t enough.
At no time did the sudden death or tiebreaker mechanic kick in, so the battle just kept on endlessly for 100’s of turns. There really needs to be something there to prevent these stalemates like there is in raids and war, etc.
I eventually got it done but it was a series of very lucky boards (just one good setup wasn’t even close to enough) and strategic use of my last battle item. I don’t think it would have been possible to end the stalemate otherwise.