During the game, you can head to The Shadow Bazaar to trade Valour and Hero Coins for resources and tools to help in your campaign against the Undead.
You can exchange 10 Valour for either 20 Mana or 200 Gold. This should be enough to enable you to employ some special abilities or recruit a new hero or unit.
You can spend 2 Valour to draw the next Hero from your deck into your hand.
At The Tavern, you can spend 2 Hero Coins to draw 3 cards of your chosen race, from which you will choose 1 card to keep. Your chosen card will be added straight into your hand, as well as to your Hero Collection for future use.