If for some reason the Marketplace experiences a shortage of magic crystals to grind for black powder, jeweler NPCs sell low-tier magic crystals for 30k each. For example, Marsella in Velia. More expensive, but guaranteed supply. With high processing skill, can average around 10 powder per crystal.

Farm de mobs à la mine de fer abandonnée pour avoir des coffres qui contiennent "Cristal magique" puis utiliser transformation "L" Meulage. Les élite donnent un coffre assuré.

You need fast and easy guide how to get Black Stone Powder?

Watch this video: https://youtu.be/zFrvEEE2Lsg