Reforging allows you to change 40% of a stat you don’t need for something more useful. But it’s only for secondary stats as crit, spirit, haste, hit and mastery, and you can only change into a stat that isn’t already on the item. It costs what the item is worth, what you can sell it for at a vendor.
If you need hit: Reforge crit and mastery to spirit or hit.
If you don’t need hit: Reforge hit or spirit to haste or mastery.
