Hero Academy 2 has three main forms of in-game currency which can be used for a wide range of functions.
Gold can be obtained through completing Quests, Duel Chests, and through opening Small Crates which may be opened once every 4 hours. Additional Gold can be bought in the Store in exchange for Gems.
Gems can be obtained through watching Advertisements on Mobile, purchasing Gem Passes, and through opening Small Crates which may be opened once every 4 hours. Gems are a valuable form of currency in game which can be used to purchase new Campaigns and Card packs. Additional Gems can be purchased in the Store with real currency.
Inks can be obtained by Disenchanting excess cards, by Completing Challenges or Campaigns, through completing Duel Chests, or Small Crates which may be opened once every 4 hours. Inks are used to Craft specific cards to add to a player’s collection.