What is Orb of Augmentation?
An Orb of Augmentation is a currency item that can be used to enhance a piece of magic equipment with an additional random affix. This can only be used on an item with one affix, since magic items can have at most one prefix and one suffix.
What is Mirror of Kalandra?
A Mirror of Kalandra (often refered to as just Mirror) is a currency item that can be used to create a mirrored duplicate of any piece of non-unique equipment, non-corrupted item, or map that is not itself a duplicate. It resembles the Path of Exile logo.
What is Blessed Orb?
A Blessed Orb is a currency item that can be used to re-roll values of the implicit modifiers on a piece of equipment. (This means the top values of an item above the line and not the bottom 6 values) This can only be used on an item that actually has implicit modifiers that can have a range of values.