Duke wanted to collect crystal cores of six different attributes, and this required not only substantial resources but also considerable luck to acquire them.
The common Earth, Fire, Wind, and Water attribute crystal cores were relatively easier to obtain. With enough proficiency, there was a chance to find some in the Black Sail Treasure Vault.
However, it wasn't that easy, as even in the Black Sail Treasure Vault, these attribute crystal cores weren't always available; it depended on luck.
If one were to solely rely on the Black Sail Treasure Vault, poor luck might mean waiting for many years, generally requiring expansion into other channels and avenues.
The reserve of crystal cores was generally quite challenging. Some wizards, having no choice, could only choose crystal cores that weren't their highest elemental affinity.
