For anyone curious, premium stage 1 is walkers, premium stage 2 is normal toons with tanky stats, premium stage 3 is premier toons with normal Priya as the lead, shield Magna, red Axel and two other toons I don’t remember. All stages don’t appear to have nightmare mode so you can easily defeat them with battle items.
Also what the actual hell Scopely, you went from S-class straight to Z-class! Are you kidding me!?