Artifacts
Artifacts are items that can be equipped by Apprentices and Heroes. They are not usable by standard units.
Artifacts can also be used as ingredients for crafting or room expansions.
Note that some heroes have slots that can utilize more than one type of item, but still only one item can be equipped in that slot.
Tome -or- 
Melee Weapon
Melee Weapon -or- 
Shield
Armor
Trinket
