When improving equipment, you can use 4 types of Black stones. In this article you will find a calculator that tells you which stones are better to buy at auction, depending on the current price on your server.
To calculate, it is enough to enter the current prices for black stones. The screenshot below shows an example of how I checked with which stones it is better to enhance my weapons.
Thanks to covertrui for fixing the bugs!

If you are not afraid of the tables, covertrui has created an improved version of the calculator. The description contains instructions.

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