At 11:00 the next morning.
Lu Yuan's body suddenly appeared in the simple room.
There was a faint smile on his face.
He had spent seven days in the Origin Land this time and gained quite a lot.
The ferocious beasts in Ancient Sea Oasis were generally stronger, and Lu Yuan had even encountered three Elite Ferocious Beasts.
After killing them, he had also obtained a set of Elite Quality leather armor.
It was not something he could use, but he could take it to the Auction House.
Not only that, he had earned a full 340,000 spirit crystals over those seven days.
That was quite a substantial fortune.
Lu Yuan recharged those spirit crystals into the Evolution Cube, and he could finally evolve Black Iron Body.
Lu Yuan discovered that evolving Black Iron Body into a boss-grade gene required nearly 200,000 spirit crystals, which was simply outrageous.
Still, he had managed to gather enough. All that remained was to break through.
The only slight regret was that after he used up the Moonstone Essence, he would have to continue using spirit crystals to temper his Gene Chain.
The improvement in his Tempering Level had slowed considerably.
On top of that, his Tempering Level had already exceeded 90%, making further improvement even slower.
Over those seven days, his Tempering Level had only reached 93%.
At this rate, it would probably take nearly another week to reach 100%.
Even Lu Yuan was progressing this slowly, so he could somewhat understand why children from Gene Warrior families like Wang Xiangxiang and Cao Yan, who were not particularly short on spirit crystals, had still spent nearly three years before approaching their first-rank breakthrough.
Cultivating with spirit crystals was still a little slow.
Unfortunately, Heavenly Materials and Earthly Treasures like Moonstone Essence were things