The important thing is that the success rate of the tool is too low, so paying for refinement will make you feel like you are losing money! The success rate of the tool should be adjusted! For example, the success rate of LV1 is 30%, LV2 success rate of 40%, LV3 has a success rate of 50%, LV4 success rate of 60%, LV5 has a success rate of 70%, LV6 success rate of 80%, LV7 attributes+1, this is the result that everyone is satisfied with! And the difficulty of this game lies in the random attributes changed by SHARD, making it difficult to successfully change the 5 out of 5 attributes you want! If high-level tools do not have a high success rate, refining will not be meaningful! Unless he's free!