Your character class represents the difficulty level
There are 6 classes in Diablo Immortal. Barbarian, Crusader, Demon Hunter, Monk, Necromancer, and Wizard. The class you choose will represent how hard or easy you want the game to be. The Barbarian and Crusader class are the best class in the game as these two classes offer the most sustain, defense, and very decent damage to clear any dungeon as you level up.