7th arena in DSA. One of the two bosses is a Templar tank.
Many lower level tanks do not use class abilities unless they are a DK using talons, standard and rarely reflect, so it is harder to tell what the rest are supposed to be.
Most bosses are not tied to any class and have their own unique mechanics so it is mostly strongs and trash mobs and the rest of the explanation above covers that. Granted, I might have missed something as there is a lot in the game.