I have bricked a number of 2GA and 3GA gears. It was painful. My kids bricked a few and was very disappointed. Now they just stopped playing (which is somewhat good from a parent’s perspective). I would suggest the following changes to improve the tempering system.
First, remove the number of tempering tries. Just increase the cost of tempering after 5 free tries - either by requiring more gold or more of some specific mats. The player will then be asked to confirm if this is the affix that they want. Then the affix will be permanently fused to the gear after the confirmation.
Second, after getting the affix that is desired, the player will proceed to roll for the stats. The number of rolls will be set to 5 tries for each affix.
Under this mechanic, the item will never be bricked and will only be sub-optimal (i.e., lower stats).
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