Time passed.
Roland did not rush onward. Instead, he stopped where he was and devoted all his efforts to developing the Thunderstone Island mine nearby.
With the efforts of numerous experts, in just ten days, Roland harvested a batch of thunderstones worth no less than fifty million gold coins, along with the corpses and magic cores of several hundred high-level Thunder Beasts, for a total value exceeding seventy million gold coins.
The haul completely filled six three-masted merchant ships. To avoid slowing down the entire expedition, Roland could only send people to transport it back to Thunder Island first.
With such a promising start, the morale of the entire expedition naturally rose even higher.
Under Roland's orders, over a hundred ships set off once more, following the passage across the sea as they headed east.
Although there were no more resource islands so close to the passage during the journey that followed, their gains did not diminish in the slightest.
According to the intelligence they had gathered earlier, on the third day after setting out again, the expedition reached a sea region where the sky was even darker and the lightning had nearly reached Saint Domain level.
Sixty miles out at sea stood an island that was not particularly large. Its most distinctive feature was a mountain peak that soared directly into the clouds.
Aside from its height, the mountain had no other remarkable features. However, according to Felicia's earlier investigation, a pool of Thunder Marrow had condensed at its summit.
Compared to thunderstone, a high-grade Magic Material, Thunder Marrow was of a far higher grade. It was a Saint Domain level Magic Material.
Its most important use was allowing someone without any Mage Talent to gain lightning-element Mage Talent and become a lightning mage.
Those who already possessed lightning-element