Introduced in the Cataclysm expansion, Reforging allows undesired stats on gear to be exchanged for more useful stats. It allows 40% of a secondary stat (such as critical strike, dodge, haste, hit or parry rating) or spirit to be exchanged for another secondary stat or spirit, and reforging is handled by NPCs known as Arcane Reforgers located in the major cities. The cost of reforging an item is equal to its sale value. Stats can only be exchanged for other stats which are not already on the gear. Earlier in Cataclysm's development, reforging was planned to be an ability of Jewelcrafters, Engineers, Tailors, Blacksmiths and Leatherworkers, who would have been able to create items similar to enchantment scrolls which other characters could use to reforge their gear.[citation needed]