Equipment is the term for your Hero’s special Items, which boost your Units' statistics. Each piece of Equipment has distinct qualities that will improve the effectiveness of certain Units, either Offensive or Defensive, depending on the Equipment itself.
Equipment Items are obtained by Attacking and Defending Battlegrounds, or purchased from the Black Market in the form of Hero Packs.
The Inventory is where your Hero’s Equipment is kept. A limited number of Equipment Items can be stored in your Hero’s Inventory, although it is possible to unlock additional Slots using Sapphires, allowing you to store more Equipment. Once all of the Slots have been filled, you must either Break Equipment Items into Shards or remove them in order to free up space. If your Inventory is full, any new Equipment Items collected will be automatically sent to the Temporary Inventory.
Items in the Temporary Inventory will be stored for 2 days after they are found, after which time they will be destroyed unless you move them to your Inventory or equip your Hero with them.
NOTE: If both of your Inventories are full and you receive new Equipment from battles, the newest Items will replace the oldest ones in the Temporary Inventory.