Gold is a regular money system thing that you buy with power ups,curses,gifts,pets,avatars,etc
Crystals
Crystals are planned to be used for something else but it was said to be used for clans by donating it to the clan at war or not in war.They said that it will power up spells of magic(didn't come out yet)
Mana
Mana has to uses in the game.You use mana to get more better stats by adding with a particular amount or more of mana.The other this is that They are used to buy rings,some of the potions,etc
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