Lee Han's curiosity to upgrade his Dark Energy leaves him no choice but to exchange for Black Onyx, the most expensive stone there.
He needed to spend twenty gold coins to get one marble-sized stone. Because this dark energy was crucial for his magic power, he decided to buy two.
The stone appears in his inventory after Lee Han clicks Buy.
He immediately extracted the stone, which appeared on his palm. Instinctively, he squeezed it, and his dark energy suddenly increased significantly.
'This stone seemed to have nearly unlimited energy I could absorb...' he said. Opening his palm, he looked at dust instead of stone. The stone would turn to dust once Lee Han extracted its energy. And the dust slowly disappeared from his palm.
'Yes, Dark Onyx stone is a rare item. You are so lucky to have that in your inventory, Master.'
