This game uses Shadowstones as the primary cryptocurency in-game, which is just a virtual placeholder for Enjin coin. So when you withdraw Shadowstones from the game you get JENJ (which is ENJ on 2nd layer – find out more about JENJ here).
Aside from Shadowstones, the game also uses gold coins as virtual currency for virtual items (which are different from blockchain items that are traded with shadowstones).