How many elements of heroes are there in MU of Heroes?

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Elements

There are 5 elements: Water, Earth, Light, Fire, Dark, these elements will counter each other as mentioned in https://wiki.battlecity.io/mu-of-heroes/heroes/overview.

Heroes

There are 8 families of heroes, including Dark Knight, Dark Wizard, Fairy Elf, Magic Gladiator, Summoner, Dark Lord, Rage Fighter, and Grow Lancer.