Can one class deal more damage to the other?

Basically, the Damage (or Counter) triangle is the game’s rock-paper-scissors system where a hero type will deal or receive 15% more damage to or from another hero type. God, Demon, and Human types follow this system. Immortals are not affected by this compatibility but they can grant powers. You can check this menu by tapping the icon with three dots forming a triangle, in the battle preparation screen.