Once you liberate the Market you will be able to see a chest button on your main screen. This button opens up your inventory.

The inventory has three tabs:

• Artifacts
• Resources
• Runes (available once you research them in the Lyceum)
• Spells (available once you research them in the Lyceum)

The Artifacts tab shows all your produced weapons and armor divided into four categories, one for each gear slot you can see in the Barracks.

• Right hand items: swords, hammers, daggers, staves, and bows.
• Left-hand items: shields
• Headwear
• Clothes & Armor

The Resources tab shows all kinds of consumables:

• Crafting ingredients, both made in the Town and earned in Campaign. Keep in mind that this type of resources has a limited capacity for storing — your warehouses aren't limitless.
• Gold, good, gems
• Rarity tokens for your Heroes

The Runes and Spells tabs will contain various spells, bombs and runes, once you craft them.