Shards

Used to make any upgrades on your Battle Scrolls, Spell Books or Minion levels!

In the top right corner of the screen you can view your Wallet, each of the Shards you have in your inventory can be viewed like this. 

There are Accessory, Armor, Minion, Spell and Weapon (left to right.)

Shards can be collected in Chests, purchased in the Daily Deals with Gold or Gems and later in the Story, certain Followers can craft Shards as well.

Note: Some items in the Daily Deals can only be purchased if you are a VIP.