The Mirror of Kalandra is a unique item in Path of Exile that is acquired through trading. It is a mirror that can be used to duplicate any item, including unique items. This means that the player can make a copy of any item they have, allowing them to stockpile rare items.

Obtaining a Mirror of Kalandra is an expensive endeavor. It is not dropped by any monsters in the game, and therefore must be bought from other players. The average price for a Mirror of Kalandra is around 5 Exalted Orbs, which is a very large sum of money in-game.

Spending a Mirror of Kalandra is a risky endeavor that should not be taken lightly. When used, it will create an exact copy of the item it is used on. This means that if the item is equipped, the copy will also be equipped, taking up an additional item slot. The item will also be bound to the character that uses the Mirror, meaning that it cannot be traded or sold. Therefore, it is important to think carefully before using a Mirror of Kalandra.