Both my party and I were brutally beaten to a pulp by two (overly) strong wyvern-type monsters that breathed fire, shot multiple lasers from a single point in front of their mouths, and built up a giant circular shock-wave in the ground that negates the ability to dodge by quick-stepping unless you quick-step backwards (But by the time you realize, it is probably already too late) that also cast spells and fill in the gaps in each others' OP attacks and stagger you so you can't move leading to an extremely quick, painful death.
(The game was Tales of Graces f just in case you were curious. The bosses were strong, I was under-leveled, and it was my first playthrough. Probably did't help that I was playing on a difficulty slightly less than hard, but higher than normal, but it was no excuse for how badly those dragon-wyvern-whatever things kicked my ass. The Shame!!!! ..And if had used a better strategy, then I might not have had to blow through all of my life bottles and highly coveted peach gels)