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.
The duplicate is identical to the original, except it cannot be modified with currency items in any way. It is labeled as a mirrored item and its image is reversed. Like regular items, there is no restriction on duplicates being dropped, traded, or sold to vendors.
1x Mirror of Kalandra = 240x Exalted Orb
The price of Mirror of Kalandra is 240 Exalted Orbs. At present, you can buy the mirror with real money or Exalted Orbs. I recommend you buy Exalted Orbs with money and then trade for Mirror of Kalandra. This will save a lot of money.
(1) Purchase 240 Exalted Orbs for $145.
(2) Trade these Exalted Orbs for a Mirror of Kalandra.
When buying a mirror from the seller directly, you will cost $165. However, you can buy Exalted Orbs firstly and then exchange for Mirror of Kalandra. This strategy will save you $20.
Because of their extreme rarity, a Mirror of Kalandra is only used to duplicate the absolute best rare items available – the mirror will be consumed on use! Players that own these top rare items will provide "Mirror service" to players looking to use their Mirrors. Usually, the Mirror is given to Mirror service provider, the item is duplicated, and then the duplicate item is then traded back. This process typically includes a "Mirror fee", to be paid to the Mirror service provider, as well as some exchange of collateral, so that the original Mirror owner is insured against having their Mirror stolen.
Typically, players that find Mirrors will be unable to use them properly, both because they cannot afford mirror fees to duplicate top items, and also because they have little use for having a single item that is the absolute best of its kind. It is often more economical to trade away a Mirror of Kalandra in order to eventually obtain many very good items, rather than using it to obtain a single item that is only marginally better.
Mirrors of Kalandra can also be used to purchase unique fishing rods from vendors. This is not recommended, as these can usually be purchased from other players for much lower prices.
(1) Mirror of Kalandra drop rate is less than 0.001%. In other words, more than 5,000 hours of play time may have a chance to obtain this currency.
(2) Mirror of Kalandra creates a mirrored copy of an equipable non-unique item. Since it is extremely rare, the currency only applies on most high-valuable items.
(3) This currency resembles the logo of the Path of Exile.
(4) Like other PoE currency items, the mirror can be only used one time. That means you duplicate a rare item and the mirror will be consumed.
The item level is 35. It is the rarest and most valuable currency. Although the currency has the lowest drop rate, you still have the chance to farm it by slain monsters, chests, and destructible containers.
Mirror Shards can be obtained from Harbingers from the Harbinger league. Harbingers can be found as part of Zana missions, Harbinger modes in the Azurite Mine, or maps using the Harbinger league modifier from Zana’s map device.
Mirror Shards also have a divination card: 13x Seven Years Bad Luck = 1x Mirror Shards
Drop Area: Defiled Cathedral Map
The odds are rather low but still have a chance to get Mirror of Kalandra.
Vendor 1x Mirror of Kalandra = Get 2x Exalted Orb + 5x Regal Orb + 1x Divine Orb
This is a downgrade recipe and not recommended.
Drop Area: The Alluring Abyss
House of Mirrors also have a divination card: 10x The Immortal = 1x House of Mirrors
Drop Area: The Hall of Grandmasters